51277621 has 4 divisors (see below), whose sum is σ = 51299200. Its totient is φ = 51256044.

The previous prime is 51277601. The next prime is 51277631. The reversal of 51277621 is 12677215.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12677215 = 5 ⋅2535443.

It is a cyclic number.

It is not a de Polignac number, because 51277621 - 2⁷ = 51277493 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 (51277601) 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, 6711 + ... + 12148.

It is an arithmetic number, because the mean of its divisors is an integer number (12824800).

Almost surely, 2^51277621 is an apocalyptic number.

It is an amenable number.

51277621 is a deficient number, since it is larger than the sum of its proper divisors (21579).

51277621 is a wasteful number, since it uses less digits than its factorization.

51277621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21578.

The product of its digits is 5880, while the sum is 31.

The square root of 51277621 is about 7160.8394061032. The cubic root of 51277621 is about 371.5146602577.

The spelling of 51277621 in words is "fifty-one million, two hundred seventy-seven thousand, six hundred twenty-one".