81413157 has 48 divisors (see below), whose sum is σ = 134684160. Its totient is φ = 43491168.

The previous prime is 81413149. The next prime is 81413159. The reversal of 81413157 is 75131418.

It is not a de Polignac number, because 81413157 - 2³ = 81413149 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81413159) 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 47 ways as a sum of consecutive naturals, for example, 287538 + ... + 287820.

It is an arithmetic number, because the mean of its divisors is an integer number (2805920).

Almost surely, 2^81413157 is an apocalyptic number.

It is an amenable number.

81413157 is a deficient number, since it is larger than the sum of its proper divisors (53271003).

81413157 is a wasteful number, since it uses less digits than its factorization.

81413157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 422 (or 415 counting only the distinct ones).

The product of its digits is 3360, while the sum is 30.

The square root of 81413157 is about 9022.9239717511. The cubic root of 81413157 is about 433.4092726216.

The spelling of 81413157 in words is "eighty-one million, four hundred thirteen thousand, one hundred fifty-seven".