51640401 has 4 divisors (see below), whose sum is σ = 68853872. Its totient is φ = 34426932.

The previous prime is 51640397. The next prime is 51640411. The reversal of 51640401 is 10404615.

51640401 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51640401 - 2² = 51640397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51640411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8606731 + ... + 8606736.

It is an arithmetic number, because the mean of its divisors is an integer number (17213468).

Almost surely, 2^51640401 is an apocalyptic number.

It is an amenable number.

51640401 is a deficient number, since it is larger than the sum of its proper divisors (17213471).

51640401 is a wasteful number, since it uses less digits than its factorization.

51640401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17213470.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 51640401 is about 7186.1255903303. The cubic root of 51640401 is about 372.3887354430.

The spelling of 51640401 in words is "fifty-one million, six hundred forty thousand, four hundred one".