5091390600921 has 9 divisors (see below), whose sum is σ = 7354240645791. Its totient is φ = 3394255887792.

The previous prime is 5091390600893. The next prime is 5091390600931. The reversal of 5091390600921 is 1290060931905.

It is a happy number.

The square root of 5091390600921 is 2256411.

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

5091390600921 is a `hidden beast` number, since 5 + 0 + 9 + 1 + 39 + 0 + 600 + 9 + 2 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 4802737995225 + 288652605696 = 2191515^2 + 537264^2 .

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 5091390600921 - 2¹¹ = 5091390598873 is a prime.

It is a super-2 number, since 2×5091390600921² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (5091390600931) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 6393165 + ... + 7145301.

Almost surely, 2^{5091390600921} is an apocalyptic number.

5091390600921 is the 2256411-st square number.

5091390600921 is the 1128206-th centered octagonal number.

It is an amenable number.

5091390600921 is a deficient number, since it is larger than the sum of its proper divisors (2262850044870).

5091390600921 is an frugal number, since it uses more digits than its factorization.

5091390600921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1504280 (or 752140 counting only the distinct ones).

The product of its (nonzero) digits is 131220, while the sum is 45.

The spelling of 5091390600921 in words is "five trillion, ninety-one billion, three hundred ninety million, six hundred thousand, nine hundred twenty-one".