51575242 has 4 divisors (see below), whose sum is σ = 77362866. Its totient is φ = 25787620.

The previous prime is 51575231. The next prime is 51575261. The reversal of 51575242 is 24257515.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 11771761 = 6309^2 + 3431^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12893809 + ... + 12893812.

Almost surely, 2^51575242 is an apocalyptic number.

51575242 is a deficient number, since it is larger than the sum of its proper divisors (25787624).

51575242 is a wasteful number, since it uses less digits than its factorization.

51575242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25787623.

The product of its digits is 14000, while the sum is 31.

The square root of 51575242 is about 7181.5904923631. The cubic root of 51575242 is about 372.2320448816.

It can be divided in two parts, 515 and 75242, that added together give a palindrome (75757).

The spelling of 51575242 in words is "fifty-one million, five hundred seventy-five thousand, two hundred forty-two".