1136431521 has 27 divisors (see below), whose sum is σ = 1746393753. Its totient is φ = 711976320.

The previous prime is 1136431463. The next prime is 1136431523. The reversal of 1136431521 is 1251346311.

It is a happy number.

The square root of 1136431521 is 33711.

It is a perfect power (a square), and thus also a powerful number.

1136431521 is a `hidden beast` number, since 1 + 1 + 3 + 643 + 15 + 2 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 372683025 + 763748496 = 19305^2 + 27636^2 .

It is not a de Polignac number, because 1136431521 - 2⁷ = 1136431393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1136431523) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1718931 + ... + 1719591.

Almost surely, 2^1136431521 is an apocalyptic number.

1136431521 is the 33711-st square number.

1136431521 is the 16856-th centered octagonal number.

It is an amenable number.

1136431521 is a deficient number, since it is larger than the sum of its proper divisors (609962232).

1136431521 is an frugal number, since it uses more digits than its factorization.

1136431521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1362 (or 681 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The cubic root of 1136431521 is about 1043.5527904699.

Adding to 1136431521 its reverse (1251346311), we get a palindrome (2387777832).

The spelling of 1136431521 in words is "one billion, one hundred thirty-six million, four hundred thirty-one thousand, five hundred twenty-one".