8913436921 has 9 divisors (see below), whose sum is σ = 9409149711. Its totient is φ = 8442609264.

The previous prime is 8913436907. The next prime is 8913436993. The reversal of 8913436921 is 1296343198.

It is a happy number.

The square root of 8913436921 is 94411.

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

It can be written as a sum of positive squares in only one way, i.e., 1796827321 + 7116609600 = 42389^2 + 84360^2 .

It is not a de Polignac number, because 8913436921 - 2²⁷ = 8779219193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8913436621) 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 8 ways as a sum of consecutive naturals, for example, 1791325 + ... + 1796293.

It is an arithmetic number, because the mean of its divisors is an integer number (1045461079).

Almost surely, 2^8913436921 is an apocalyptic number.

8913436921 is the 94411-st square number.

8913436921 is the 47206-th centered octagonal number.

It is an amenable number.

8913436921 is a deficient number, since it is larger than the sum of its proper divisors (495712790).

8913436921 is an frugal number, since it uses more digits than its factorization.

8913436921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9976 (or 4988 counting only the distinct ones).

The product of its digits is 279936, while the sum is 46.

The cubic root of 8913436921 is about 2073.3934956649.

The spelling of 8913436921 in words is "eight billion, nine hundred thirteen million, four hundred thirty-six thousand, nine hundred twenty-one".