51640001 has 4 divisors (see below), whose sum is σ = 59017152. Its totient is φ = 44262852.

The previous prime is 51639997. The next prime is 51640007. The reversal of 51640001 is 10004615.

It is a happy number.

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 51640001 - 2² = 51639997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51640007) 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, 3688565 + ... + 3688578.

It is an arithmetic number, because the mean of its divisors is an integer number (14754288).

Almost surely, 2^51640001 is an apocalyptic number.

It is an amenable number.

51640001 is a deficient number, since it is larger than the sum of its proper divisors (7377151).

51640001 is an equidigital number, since it uses as much as digits as its factorization.

51640001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7377150.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 51640001 is about 7186.0977588675. The cubic root of 51640001 is about 372.3877739486.

Adding to 51640001 its reverse (10004615), we get a palindrome (61644616).

The spelling of 51640001 in words is "fifty-one million, six hundred forty thousand, one".