51564497 has 4 divisors (see below), whose sum is σ = 52185840. Its totient is φ = 50943156.

The previous prime is 51564481. The next prime is 51564503. The reversal of 51564497 is 79446515.

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 51564497 - 2⁴ = 51564481 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51564427) 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, 310547 + ... + 310712.

It is an arithmetic number, because the mean of its divisors is an integer number (13046460).

Almost surely, 2^51564497 is an apocalyptic number.

It is an amenable number.

51564497 is a deficient number, since it is larger than the sum of its proper divisors (621343).

51564497 is an equidigital number, since it uses as much as digits as its factorization.

51564497 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621342.

The product of its digits is 151200, while the sum is 41.

The square root of 51564497 is about 7180.8423600578. The cubic root of 51564497 is about 372.2061932588.

The spelling of 51564497 in words is "fifty-one million, five hundred sixty-four thousand, four hundred ninety-seven".