51422621 has 4 divisors (see below), whose sum is σ = 51627744. Its totient is φ = 51217500.

The previous prime is 51422617. The next prime is 51422629. The reversal of 51422621 is 12622415.

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 51422621 - 2² = 51422617 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 (51422629) 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, 102185 + ... + 102686.

It is an arithmetic number, because the mean of its divisors is an integer number (12906936).

Almost surely, 2^51422621 is an apocalyptic number.

It is an amenable number.

51422621 is a deficient number, since it is larger than the sum of its proper divisors (205123).

51422621 is a wasteful number, since it uses less digits than its factorization.

51422621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205122.

The product of its digits is 960, while the sum is 23.

The square root of 51422621 is about 7170.9567701946. The cubic root of 51422621 is about 371.8645135192.

The spelling of 51422621 in words is "fifty-one million, four hundred twenty-two thousand, six hundred twenty-one".