81337250 has 16 divisors (see below), whose sum is σ = 152263800. Its totient is φ = 32534800.

The previous prime is 81337247. The next prime is 81337253. The reversal of 81337250 is 5273318.

It is an interprime number because it is at equal distance from previous prime (81337247) and next prime (81337253).

It can be written as a sum of positive squares in 4 ways, for example, as 12397441 + 68939809 = 3521^2 + 8303^2 .

It is not an unprimeable number, because it can be changed into a prime (81337253) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 162425 + ... + 162924.

Almost surely, 2^81337250 is an apocalyptic number.

81337250 is a deficient number, since it is larger than the sum of its proper divisors (70926550).

81337250 is a wasteful number, since it uses less digits than its factorization.

81337250 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 325366 (or 325356 counting only the distinct ones).

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 81337250 is about 9018.7166492800. The cubic root of 81337250 is about 433.2745317977.

The spelling of 81337250 in words is "eighty-one million, three hundred thirty-seven thousand, two hundred fifty".