51345657 has 56 divisors (see below), whose sum is σ = 88664160. Its totient is φ = 29393280.

The previous prime is 51345643. The next prime is 51345691. The reversal of 51345657 is 75654315.

It is not a de Polignac number, because 51345657 - 2¹¹ = 51343609 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51345607) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 152193 + ... + 152529.

Almost surely, 2^51345657 is an apocalyptic number.

51345657 is a gapful number since it is divisible by the number (57) formed by its first and last digit.

It is an amenable number.

51345657 is a deficient number, since it is larger than the sum of its proper divisors (37318503).

51345657 is a wasteful number, since it uses less digits than its factorization.

51345657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385 (or 370 counting only the distinct ones).

The product of its digits is 63000, while the sum is 36.

The square root of 51345657 is about 7165.5883917512. The cubic root of 51345657 is about 371.6788982504.

The spelling of 51345657 in words is "fifty-one million, three hundred forty-five thousand, six hundred fifty-seven".