81553234 has 8 divisors (see below), whose sum is σ = 139805568. Its totient is φ = 34951380.

The previous prime is 81553231. The next prime is 81553243. The reversal of 81553234 is 43235518.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-6 number, since 6×81553234⁶ (a number of 49 digits) contains 666666 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 81553196 and 81553205.

It is not an unprimeable number, because it can be changed into a prime (81553231) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2912602 + ... + 2912629.

It is an arithmetic number, because the mean of its divisors is an integer number (17475696).

Almost surely, 2^81553234 is an apocalyptic number.

81553234 is a deficient number, since it is larger than the sum of its proper divisors (58252334).

81553234 is a wasteful number, since it uses less digits than its factorization.

81553234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5825240.

The product of its digits is 14400, while the sum is 31.

The square root of 81553234 is about 9030.6829199125. The cubic root of 81553234 is about 433.6577004646.

The spelling of 81553234 in words is "eighty-one million, five hundred fifty-three thousand, two hundred thirty-four".