51245557 has 12 divisors (see below), whose sum is σ = 57532608. Its totient is φ = 45590600.

The previous prime is 51245539. The next prime is 51245561. The reversal of 51245557 is 75554215.

It is not a de Polignac number, because 51245557 - 2¹⁹ = 50721269 is a prime.

It is a super-2 number, since 2×51245557² = 5252214224480498, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51245507) 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, 1182 + ... + 10192.

It is an arithmetic number, because the mean of its divisors is an integer number (4794384).

Almost surely, 2^51245557 is an apocalyptic number.

It is an amenable number.

51245557 is a deficient number, since it is larger than the sum of its proper divisors (6287051).

51245557 is a wasteful number, since it uses less digits than its factorization.

51245557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9080 (or 9069 counting only the distinct ones).

The product of its digits is 35000, while the sum is 34.

The square root of 51245557 is about 7158.6002123320. The cubic root of 51245557 is about 371.4372078226.

The spelling of 51245557 in words is "fifty-one million, two hundred forty-five thousand, five hundred fifty-seven".