81154692 has 18 divisors (see below), whose sum is σ = 205141118. Its totient is φ = 27051552.

The previous prime is 81154691. The next prime is 81154693. The reversal of 81154692 is 29645118.

It is an interprime number because it is at equal distance from previous prime (81154691) and next prime (81154693).

It can be written as a sum of positive squares in only one way, i.e., 81108036 + 46656 = 9006^2 + 216^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×81154692² = 13172168067229728, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 2254297 = 81154692 / (8 + 1 + 1 + 5 + 4 + 6 + 9 + 2).

It is not an unprimeable number, because it can be changed into a prime (81154691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1127113 + ... + 1127184.

Almost surely, 2^81154692 is an apocalyptic number.

It is an amenable number.

81154692 is an abundant number, since it is smaller than the sum of its proper divisors (123986426).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

81154692 is a wasteful number, since it uses less digits than its factorization.

81154692 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2254307 (or 2254302 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 81154692 is about 9008.5899007558. The cubic root of 81154692 is about 432.9501335544.

The spelling of 81154692 in words is "eighty-one million, one hundred fifty-four thousand, six hundred ninety-two".