81154164 has 48 divisors (see below), whose sum is σ = 233061248. Its totient is φ = 21403008.

The previous prime is 81154153. The next prime is 81154223. The reversal of 81154164 is 46145118.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36067 + ... + 38250.

Almost surely, 2^81154164 is an apocalyptic number.

81154164 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

81154164 is an abundant number, since it is smaller than the sum of its proper divisors (151907084).

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

81154164 is a wasteful number, since it uses less digits than its factorization.

81154164 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74344 (or 74342 counting only the distinct ones).

The product of its digits is 3840, while the sum is 30.

The square root of 81154164 is about 9008.5605953449. The cubic root of 81154164 is about 432.9491946144.

It can be divided in two parts, 81154 and 164, that added together give a palindrome (81318).

The spelling of 81154164 in words is "eighty-one million, one hundred fifty-four thousand, one hundred sixty-four".