51742621 has 4 divisors (see below), whose sum is σ = 59134432. Its totient is φ = 44350812.

The previous prime is 51742609. The next prime is 51742633. The reversal of 51742621 is 12624715.

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 an interprime number because it is at equal distance from previous prime (51742609) and next prime (51742633).

It is a cyclic number.

It is not a de Polignac number, because 51742621 - 2⁵ = 51742589 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 51742621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51742601) 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, 3695895 + ... + 3695908.

It is an arithmetic number, because the mean of its divisors is an integer number (14783608).

Almost surely, 2^51742621 is an apocalyptic number.

It is an amenable number.

51742621 is a deficient number, since it is larger than the sum of its proper divisors (7391811).

51742621 is an equidigital number, since it uses as much as digits as its factorization.

51742621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7391810.

The product of its digits is 3360, while the sum is 28.

The square root of 51742621 is about 7193.2343907313. The cubic root of 51742621 is about 372.6342827728.

The spelling of 51742621 in words is "fifty-one million, seven hundred forty-two thousand, six hundred twenty-one".