81369250 has 16 divisors (see below), whose sum is σ = 152323704. Its totient is φ = 32547600.

The previous prime is 81369241. The next prime is 81369269. The reversal of 81369250 is 5296318.

It can be written as a sum of positive squares in 4 ways, for example, as 38950081 + 42419169 = 6241^2 + 6513^2 .

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, 162489 + ... + 162988.

Almost surely, 2^81369250 is an apocalyptic number.

81369250 is a deficient number, since it is larger than the sum of its proper divisors (70954454).

81369250 is a wasteful number, since it uses less digits than its factorization.

81369250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325494 (or 325484 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 81369250 is about 9020.4905631568. The cubic root of 81369250 is about 433.3313445011.

The spelling of 81369250 in words is "eighty-one million, three hundred sixty-nine thousand, two hundred fifty".