51993250 has 16 divisors (see below), whose sum is σ = 97331832. Its totient is φ = 20797200.

The previous prime is 51993241. The next prime is 51993283. The reversal of 51993250 is 5239915.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 20711601 + 31281649 = 4551^2 + 5593^2 .

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, 103737 + ... + 104236.

Almost surely, 2^51993250 is an apocalyptic number.

51993250 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51993250 is a deficient number, since it is larger than the sum of its proper divisors (45338582).

51993250 is a wasteful number, since it uses less digits than its factorization.

51993250 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207990 (or 207980 counting only the distinct ones).

The product of its (nonzero) digits is 12150, while the sum is 34.

The square root of 51993250 is about 7210.6345074480. The cubic root of 51993250 is about 373.2349646942.

The spelling of 51993250 in words is "fifty-one million, nine hundred ninety-three thousand, two hundred fifty".