81037115 has 8 divisors (see below), whose sum is σ = 99616608. Its totient is φ = 63248320.

The previous prime is 81037091. The next prime is 81037153. The reversal of 81037115 is 51173018.

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

It is a de Polignac number, because none of the positive numbers 2^k-81037115 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 197447 + ... + 197856.

It is an arithmetic number, because the mean of its divisors is an integer number (12452076).

Almost surely, 2^81037115 is an apocalyptic number.

81037115 is a deficient number, since it is larger than the sum of its proper divisors (18579493).

81037115 is a wasteful number, since it uses less digits than its factorization.

81037115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395349.

The product of its (nonzero) digits is 840, while the sum is 26.

The square root of 81037115 is about 9002.0617082977. The cubic root of 81037115 is about 432.7409463009.

The spelling of 81037115 in words is "eighty-one million, thirty-seven thousand, one hundred fifteen".