51660413 has 4 divisors (see below), whose sum is σ = 59040480. Its totient is φ = 44280348.

The previous prime is 51660409. The next prime is 51660431. The reversal of 51660413 is 31406615.

51660413 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 51660413 - 2² = 51660409 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 (51660443) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3690023 + ... + 3690036.

It is an arithmetic number, because the mean of its divisors is an integer number (14760120).

Almost surely, 2^51660413 is an apocalyptic number.

It is an amenable number.

51660413 is a deficient number, since it is larger than the sum of its proper divisors (7380067).

51660413 is an equidigital number, since it uses as much as digits as its factorization.

51660413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7380066.

The product of its (nonzero) digits is 2160, while the sum is 26.

The square root of 51660413 is about 7187.5178608474. The cubic root of 51660413 is about 372.4368326743.

The spelling of 51660413 in words is "fifty-one million, six hundred sixty thousand, four hundred thirteen".