51657199 has 6 divisors (see below), whose sum is σ = 56780360. Its totient is φ = 46960980.

The previous prime is 51657197. The next prime is 51657223. The reversal of 51657199 is 99175615.

It is not a de Polignac number, because 51657199 - 2¹ = 51657197 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51657197) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 213339 + ... + 213580.

Almost surely, 2^51657199 is an apocalyptic number.

51657199 is a deficient number, since it is larger than the sum of its proper divisors (5123161).

51657199 is a wasteful number, since it uses less digits than its factorization.

51657199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 426941 (or 426930 counting only the distinct ones).

The product of its digits is 85050, while the sum is 43.

The square root of 51657199 is about 7187.2942753167. The cubic root of 51657199 is about 372.4291089214.

The spelling of 51657199 in words is "fifty-one million, six hundred fifty-seven thousand, one hundred ninety-nine".