81495250 has 32 divisors (see below), whose sum is σ = 153487152. Its totient is φ = 32400000.

The previous prime is 81495247. The next prime is 81495269. The reversal of 81495250 is 5259418.

It can be written as a sum of positive squares in 8 ways, for example, as 10582009 + 70913241 = 3253^2 + 8421^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 44350 + ... + 46150.

Almost surely, 2^81495250 is an apocalyptic number.

81495250 is a deficient number, since it is larger than the sum of its proper divisors (71991902).

81495250 is a wasteful number, since it uses less digits than its factorization.

81495250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1999 (or 1989 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 81495250 is about 9027.4719606322. The cubic root of 81495250 is about 433.5548998414.

The spelling of 81495250 in words is "eighty-one million, four hundred ninety-five thousand, two hundred fifty".