51742257 has 16 divisors (see below), whose sum is σ = 80334720. Its totient is φ = 29008512.

The previous prime is 51742241. The next prime is 51742261. The reversal of 51742257 is 75224715.

It is not a de Polignac number, because 51742257 - 2⁴ = 51742241 is a prime.

It is a super-2 number, since 2×51742257² = 5354522318908098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (51742267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22132 + ... + 24357.

It is an arithmetic number, because the mean of its divisors is an integer number (5020920).

Almost surely, 2^51742257 is an apocalyptic number.

It is an amenable number.

51742257 is a deficient number, since it is larger than the sum of its proper divisors (28592463).

51742257 is a wasteful number, since it uses less digits than its factorization.

51742257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46552.

The product of its digits is 19600, while the sum is 33.

The square root of 51742257 is about 7193.2090891340. The cubic root of 51742257 is about 372.6334089658.

The spelling of 51742257 in words is "fifty-one million, seven hundred forty-two thousand, two hundred fifty-seven".