5651612521 has 4 divisors (see below), whose sum is σ = 5723152000. Its totient is φ = 5580073044.

The previous prime is 5651612467. The next prime is 5651612531. The reversal of 5651612521 is 1252161565.

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 5651612521 - 2⁹ = 5651612009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5651612531) 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, 35769621 + ... + 35769778.

It is an arithmetic number, because the mean of its divisors is an integer number (1430788000).

Almost surely, 2^5651612521 is an apocalyptic number.

It is an amenable number.

5651612521 is a deficient number, since it is larger than the sum of its proper divisors (71539479).

5651612521 is an equidigital number, since it uses as much as digits as its factorization.

5651612521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71539478.

The product of its digits is 18000, while the sum is 34.

The square root of 5651612521 is about 75177.2074567817. The cubic root of 5651612521 is about 1781.2469192010.

The spelling of 5651612521 in words is "five billion, six hundred fifty-one million, six hundred twelve thousand, five hundred twenty-one".