81038156 has 6 divisors (see below), whose sum is σ = 141816780. Its totient is φ = 40519076.

The previous prime is 81038143. The next prime is 81038161. The reversal of 81038156 is 65183018.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10129766 + ... + 10129773.

It is an arithmetic number, because the mean of its divisors is an integer number (23636130).

Almost surely, 2^81038156 is an apocalyptic number.

It is an amenable number.

81038156 is a deficient number, since it is larger than the sum of its proper divisors (60778624).

81038156 is a wasteful number, since it uses less digits than its factorization.

81038156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20259543 (or 20259541 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 81038156 is about 9002.1195282000. The cubic root of 81038156 is about 432.7427992848.

The spelling of 81038156 in words is "eighty-one million, thirty-eight thousand, one hundred fifty-six".