81037929 has 32 divisors (see below), whose sum is σ = 133816320. Its totient is φ = 42561792.

The previous prime is 81037897. The next prime is 81037981. The reversal of 81037929 is 92973018.

It is not a de Polignac number, because 81037929 - 2⁵ = 81037897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81037529) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 12712 + ... + 17990.

It is an arithmetic number, because the mean of its divisors is an integer number (4181760).

Almost surely, 2^81037929 is an apocalyptic number.

It is an amenable number.

81037929 is a deficient number, since it is larger than the sum of its proper divisors (52778391).

81037929 is a wasteful number, since it uses less digits than its factorization.

81037929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349.

The product of its (nonzero) digits is 27216, while the sum is 39.

The square root of 81037929 is about 9002.1069200493. The cubic root of 81037929 is about 432.7423952253.

The spelling of 81037929 in words is "eighty-one million, thirty-seven thousand, nine hundred twenty-nine".