51941621 has 4 divisors (see below), whose sum is σ = 51956544. Its totient is φ = 51926700.

The previous prime is 51941609. The next prime is 51941623. The reversal of 51941621 is 12614915.

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 a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12614915 = 5 ⋅2522983.

It is a cyclic number.

It is not a de Polignac number, because 51941621 - 2¹⁰ = 51940597 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 (51941623) 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, 836 + ... + 10226.

It is an arithmetic number, because the mean of its divisors is an integer number (12989136).

Almost surely, 2^51941621 is an apocalyptic number.

It is an amenable number.

51941621 is a deficient number, since it is larger than the sum of its proper divisors (14923).

51941621 is an equidigital number, since it uses as much as digits as its factorization.

51941621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14922.

The product of its digits is 2160, while the sum is 29.

The square root of 51941621 is about 7207.0535588408. The cubic root of 51941621 is about 373.1113837181. Note that the first 3 decimals are identical.

The spelling of 51941621 in words is "fifty-one million, nine hundred forty-one thousand, six hundred twenty-one".