51742657 has 4 divisors (see below), whose sum is σ = 51757056. Its totient is φ = 51728260.

The previous prime is 51742633. The next prime is 51742667. The reversal of 51742657 is 75624715.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-51742657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51742667) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3168 + ... + 10654.

It is an arithmetic number, because the mean of its divisors is an integer number (12939264).

Almost surely, 2^51742657 is an apocalyptic number.

It is an amenable number.

51742657 is a deficient number, since it is larger than the sum of its proper divisors (14399).

51742657 is an equidigital number, since it uses as much as digits as its factorization.

51742657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14398.

The product of its digits is 58800, while the sum is 37.

The square root of 51742657 is about 7193.2368930823. The cubic root of 51742657 is about 372.6343691930.

The spelling of 51742657 in words is "fifty-one million, seven hundred forty-two thousand, six hundred fifty-seven".