5151605621 has 4 divisors (see below), whose sum is σ = 5151755532. Its totient is φ = 5151455712.

The previous prime is 5151605609. The next prime is 5151605623. The reversal of 5151605621 is 1265061515.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 2630561521 + 2521044100 = 51289^2 + 50210^2 .

It is a cyclic number.

It is not a de Polignac number, because 5151605621 - 2²⁶ = 5084496757 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 (5151605623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5075 + ... + 101631.

It is an arithmetic number, because the mean of its divisors is an integer number (1287938883).

Almost surely, 2^5151605621 is an apocalyptic number.

It is an amenable number.

5151605621 is a deficient number, since it is larger than the sum of its proper divisors (149911).

5151605621 is an equidigital number, since it uses as much as digits as its factorization.

5151605621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 149910.

The product of its (nonzero) digits is 9000, while the sum is 32.

The square root of 5151605621 is about 71774.6864918266. The cubic root of 5151605621 is about 1727.0869506861.

The spelling of 5151605621 in words is "five billion, one hundred fifty-one million, six hundred five thousand, six hundred twenty-one".