51476921 has 4 divisors (see below), whose sum is σ = 53715072. Its totient is φ = 49238772.

The previous prime is 51476903. The next prime is 51476959. The reversal of 51476921 is 12967415.

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 51476921 - 2⁶ = 51476857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (51476981) 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, 1119041 + ... + 1119086.

It is an arithmetic number, because the mean of its divisors is an integer number (13428768).

Almost surely, 2^51476921 is an apocalyptic number.

It is an amenable number.

51476921 is a deficient number, since it is larger than the sum of its proper divisors (2238151).

51476921 is a wasteful number, since it uses less digits than its factorization.

51476921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2238150.

The product of its digits is 15120, while the sum is 35.

The square root of 51476921 is about 7174.7418768901. The cubic root of 51476921 is about 371.9953582687.

The spelling of 51476921 in words is "fifty-one million, four hundred seventy-six thousand, nine hundred twenty-one".