51440001 has 4 divisors (see below), whose sum is σ = 68586672. Its totient is φ = 34293332.

The previous prime is 51439991. The next prime is 51440003. The reversal of 51440001 is 10004415.

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 51440001 - 2⁹ = 51439489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (51440003) 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, 8573331 + ... + 8573336.

It is an arithmetic number, because the mean of its divisors is an integer number (17146668).

Almost surely, 2^51440001 is an apocalyptic number.

It is an amenable number.

51440001 is a deficient number, since it is larger than the sum of its proper divisors (17146671).

51440001 is a wasteful number, since it uses less digits than its factorization.

51440001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17146670.

The product of its (nonzero) digits is 80, while the sum is 15.

The square root of 51440001 is about 7172.1685005304. The cubic root of 51440001 is about 371.9064034964.

Adding to 51440001 its reverse (10004415), we get a palindrome (61444416).

The spelling of 51440001 in words is "fifty-one million, four hundred forty thousand, one".