2572136521 has 4 divisors (see below), whose sum is σ = 2572706500. Its totient is φ = 2571566544.

The previous prime is 2572136509. The next prime is 2572136537. The reversal of 2572136521 is 1256312752.

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 2170534921 + 401601600 = 46589^2 + 20040^2 .

It is a cyclic number.

It is not a de Polignac number, because 2572136521 - 2⁷ = 2572136393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2572136561) 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, 278166 + ... + 287263.

It is an arithmetic number, because the mean of its divisors is an integer number (643176625).

Almost surely, 2^2572136521 is an apocalyptic number.

It is an amenable number.

2572136521 is a deficient number, since it is larger than the sum of its proper divisors (569979).

2572136521 is an equidigital number, since it uses as much as digits as its factorization.

2572136521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 569978.

The product of its digits is 25200, while the sum is 34.

The square root of 2572136521 is about 50716.2352802335. The cubic root of 2572136521 is about 1370.1391374839.

The spelling of 2572136521 in words is "two billion, five hundred seventy-two million, one hundred thirty-six thousand, five hundred twenty-one".