81078951 has 16 divisors (see below), whose sum is σ = 113615744. Its totient is φ = 51365664.

The previous prime is 81078917. The next prime is 81078953. The reversal of 81078951 is 15987018.

It is a de Polignac number, because none of the positive numbers 2^k-81078951 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (81078953) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3721 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (7100984).

Almost surely, 2^81078951 is an apocalyptic number.

81078951 is a deficient number, since it is larger than the sum of its proper divisors (32536793).

81078951 is a wasteful number, since it uses less digits than its factorization.

81078951 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17070.

The product of its (nonzero) digits is 20160, while the sum is 39.

The square root of 81078951 is about 9004.3850983840. The cubic root of 81078951 is about 432.8154020432.

The spelling of 81078951 in words is "eighty-one million, seventy-eight thousand, nine hundred fifty-one".