81254265 has 32 divisors (see below), whose sum is σ = 132710400. Its totient is φ = 42444480.

The previous prime is 81254231. The next prime is 81254267. The reversal of 81254265 is 56245218.

It is not a de Polignac number, because 81254265 - 2¹⁷ = 81123193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (81254267) 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, 226156 + ... + 226514.

It is an arithmetic number, because the mean of its divisors is an integer number (4147200).

Almost surely, 2^81254265 is an apocalyptic number.

It is an amenable number.

81254265 is a deficient number, since it is larger than the sum of its proper divisors (51456135).

81254265 is a wasteful number, since it uses less digits than its factorization.

81254265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637.

The product of its digits is 19200, while the sum is 33.

The square root of 81254265 is about 9014.1147651891. The cubic root of 81254265 is about 433.1271310195.

The spelling of 81254265 in words is "eighty-one million, two hundred fifty-four thousand, two hundred sixty-five".