51664441 has 4 divisors (see below), whose sum is σ = 51715584. Its totient is φ = 51613300.

The previous prime is 51664433. The next prime is 51664447. The reversal of 51664441 is 14446615.

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 51664441 - 2³ = 51664433 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51664447) 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, 24025 + ... + 26086.

It is an arithmetic number, because the mean of its divisors is an integer number (12928896).

Almost surely, 2^51664441 is an apocalyptic number.

It is an amenable number.

51664441 is a deficient number, since it is larger than the sum of its proper divisors (51143).

51664441 is a wasteful number, since it uses less digits than its factorization.

51664441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51142.

The product of its digits is 11520, while the sum is 31.

The square root of 51664441 is about 7187.7980633849. The cubic root of 51664441 is about 372.4465121464.

The spelling of 51664441 in words is "fifty-one million, six hundred sixty-four thousand, four hundred forty-one".