51168257 has 4 divisors (see below), whose sum is σ = 58478016. Its totient is φ = 43858500.

The previous prime is 51168251. The next prime is 51168277. The reversal of 51168257 is 75286115.

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 not a de Polignac number, because 51168257 - 2⁶ = 51168193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51168251) 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, 3654869 + ... + 3654882.

It is an arithmetic number, because the mean of its divisors is an integer number (14619504).

Almost surely, 2^51168257 is an apocalyptic number.

It is an amenable number.

51168257 is a deficient number, since it is larger than the sum of its proper divisors (7309759).

51168257 is an equidigital number, since it uses as much as digits as its factorization.

51168257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7309758.

The product of its digits is 16800, while the sum is 35.

The square root of 51168257 is about 7153.1990745400. The cubic root of 51168257 is about 371.2503523069.

The spelling of 51168257 in words is "fifty-one million, one hundred sixty-eight thousand, two hundred fifty-seven".