51404637 has 4 divisors (see below), whose sum is σ = 68539520. Its totient is φ = 34269756.

The previous prime is 51404623. The next prime is 51404677. The reversal of 51404637 is 73640415.

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 51404637 - 2⁴ = 51404621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51404677) 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, 8567437 + ... + 8567442.

It is an arithmetic number, because the mean of its divisors is an integer number (17134880).

Almost surely, 2^51404637 is an apocalyptic number.

It is an amenable number.

51404637 is a deficient number, since it is larger than the sum of its proper divisors (17134883).

51404637 is a wasteful number, since it uses less digits than its factorization.

51404637 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17134882.

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 51404637 is about 7169.7027135021. The cubic root of 51404637 is about 371.8211578193.

The spelling of 51404637 in words is "fifty-one million, four hundred four thousand, six hundred thirty-seven".