81912495 has 16 divisors (see below), whose sum is σ = 149783040. Its totient is φ = 37445664.

The previous prime is 81912469. The next prime is 81912503. The reversal of 81912495 is 59421918.

It is not a de Polignac number, because 81912495 - 2¹¹ = 81910447 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389955 + ... + 390164.

It is an arithmetic number, because the mean of its divisors is an integer number (9361440).

Almost surely, 2^81912495 is an apocalyptic number.

81912495 is a deficient number, since it is larger than the sum of its proper divisors (67870545).

81912495 is a wasteful number, since it uses less digits than its factorization.

81912495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 780134.

The product of its digits is 25920, while the sum is 39.

The square root of 81912495 is about 9050.5521930985. The cubic root of 81912495 is about 434.2935554219.

The spelling of 81912495 in words is "eighty-one million, nine hundred twelve thousand, four hundred ninety-five".