51606613 has 4 divisors (see below), whose sum is σ = 51706188. Its totient is φ = 51507040.

The previous prime is 51606559. The next prime is 51606617. The reversal of 51606613 is 31660615.

51606613 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.

It can be written as a sum of positive squares in 2 ways, for example, as 4588164 + 47018449 = 2142^2 + 6857^2 .

It is a cyclic number.

It is not a de Polignac number, because 51606613 - 2²¹ = 49509461 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 (51606617) 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, 49006 + ... + 50047.

It is an arithmetic number, because the mean of its divisors is an integer number (12926547).

Almost surely, 2^51606613 is an apocalyptic number.

It is an amenable number.

51606613 is a deficient number, since it is larger than the sum of its proper divisors (99575).

51606613 is an equidigital number, since it uses as much as digits as its factorization.

51606613 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99574.

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 51606613 is about 7183.7742865433. The cubic root of 51606613 is about 372.3075004957.

The spelling of 51606613 in words is "fifty-one million, six hundred six thousand, six hundred thirteen".