51362257 has 4 divisors (see below), whose sum is σ = 53019136. Its totient is φ = 49705380.

The previous prime is 51362251. The next prime is 51362293. The reversal of 51362257 is 75226315.

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 51362257 - 2³ = 51362249 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 1656847 = 51362257 / (5 + 1 + 3 + 6 + 2 + 2 + 5 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51362251) 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, 828393 + ... + 828454.

It is an arithmetic number, because the mean of its divisors is an integer number (13254784).

Almost surely, 2^51362257 is an apocalyptic number.

It is an amenable number.

51362257 is a deficient number, since it is larger than the sum of its proper divisors (1656879).

51362257 is a wasteful number, since it uses less digits than its factorization.

51362257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1656878.

The product of its digits is 12600, while the sum is 31.

The square root of 51362257 is about 7166.7466119572. The cubic root of 51362257 is about 371.7189484077.

The spelling of 51362257 in words is "fifty-one million, three hundred sixty-two thousand, two hundred fifty-seven".