81358156 has 12 divisors (see below), whose sum is σ = 155320200. Its totient is φ = 36980960.

The previous prime is 81358129. The next prime is 81358157. The reversal of 81358156 is 65185318.

It is not an unprimeable number, because it can be changed into a prime (81358157) 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, 924481 + ... + 924568.

It is an arithmetic number, because the mean of its divisors is an integer number (12943350).

Almost surely, 2^81358156 is an apocalyptic number.

It is an amenable number.

81358156 is a deficient number, since it is larger than the sum of its proper divisors (73962044).

81358156 is a wasteful number, since it uses less digits than its factorization.

81358156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1849064 (or 1849062 counting only the distinct ones).

The product of its digits is 28800, while the sum is 37.

The square root of 81358156 is about 9019.8756088984. The cubic root of 81358156 is about 433.3116499341.

The spelling of 81358156 in words is "eighty-one million, three hundred fifty-eight thousand, one hundred fifty-six".