81379250 has 16 divisors (see below), whose sum is σ = 152342424. Its totient is φ = 32551600.

The previous prime is 81379241. The next prime is 81379283. The reversal of 81379250 is 5297318.

It can be written as a sum of positive squares in 4 ways, for example, as 23512801 + 57866449 = 4849^2 + 7607^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 81379250.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162509 + ... + 163008.

Almost surely, 2^81379250 is an apocalyptic number.

81379250 is a deficient number, since it is larger than the sum of its proper divisors (70963174).

81379250 is a wasteful number, since it uses less digits than its factorization.

81379250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325534 (or 325524 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 81379250 is about 9021.0448397068. The cubic root of 81379250 is about 433.3490954161.

The spelling of 81379250 in words is "eighty-one million, three hundred seventy-nine thousand, two hundred fifty".