51625257 has 4 divisors (see below), whose sum is σ = 68833680. Its totient is φ = 34416836.

The previous prime is 51625237. The next prime is 51625283. The reversal of 51625257 is 75252615.

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.

It is a cyclic number.

It is not a de Polignac number, because 51625257 - 2¹² = 51621161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51625237) 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, 8604207 + ... + 8604212.

It is an arithmetic number, because the mean of its divisors is an integer number (17208420).

Almost surely, 2^51625257 is an apocalyptic number.

It is an amenable number.

51625257 is a deficient number, since it is larger than the sum of its proper divisors (17208423).

51625257 is a wasteful number, since it uses less digits than its factorization.

51625257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17208422.

The product of its digits is 21000, while the sum is 33.

The square root of 51625257 is about 7185.0718159250. The cubic root of 51625257 is about 372.3523297977.

The spelling of 51625257 in words is "fifty-one million, six hundred twenty-five thousand, two hundred fifty-seven".