51693550 has 24 divisors (see below), whose sum is σ = 97969176. Its totient is φ = 20286240.

The previous prime is 51693541. The next prime is 51693553. The reversal of 51693550 is 5539615.

It is a super-2 number, since 2×51693550² = 5344446223205000, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51693553) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7104 + ... + 12403.

It is an arithmetic number, because the mean of its divisors is an integer number (4082049).

Almost surely, 2^51693550 is an apocalyptic number.

51693550 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

51693550 is a deficient number, since it is larger than the sum of its proper divisors (46275626).

51693550 is a wasteful number, since it uses less digits than its factorization.

51693550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19572 (or 19567 counting only the distinct ones).

The product of its (nonzero) digits is 20250, while the sum is 34.

The square root of 51693550 is about 7189.8226681887. The cubic root of 51693550 is about 372.5164474818.

The spelling of 51693550 in words is "fifty-one million, six hundred ninety-three thousand, five hundred fifty".