51532621 has 4 divisors (see below), whose sum is σ = 58894432. Its totient is φ = 44170812.

The previous prime is 51532609. The next prime is 51532643. The reversal of 51532621 is 12623515.

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 51532621 - 2⁷ = 51532493 is a prime.

It is a super-2 number, since 2×51532621² = 5311222054259282, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51532021) 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, 3680895 + ... + 3680908.

It is an arithmetic number, because the mean of its divisors is an integer number (14723608).

Almost surely, 2^51532621 is an apocalyptic number.

It is an amenable number.

51532621 is a deficient number, since it is larger than the sum of its proper divisors (7361811).

51532621 is an equidigital number, since it uses as much as digits as its factorization.

51532621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7361810.

The product of its digits is 1800, while the sum is 25.

The square root of 51532621 is about 7178.6225001737. The cubic root of 51532621 is about 372.1294809798.

The spelling of 51532621 in words is "fifty-one million, five hundred thirty-two thousand, six hundred twenty-one".