5161499921 has 2 divisors, whose sum is σ = 5161499922. Its totient is φ = 5161499920.

The previous prime is 5161499899. The next prime is 5161499957. The reversal of 5161499921 is 1299941615.

5161499921 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5126560000 + 34939921 = 71600^2 + 5911^2 .

It is a cyclic number.

It is not a de Polignac number, because 5161499921 - 2⁶ = 5161499857 is a prime.

It is not a weakly prime, because it can be changed into another prime (5161499221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2580749960 + 2580749961.

It is an arithmetic number, because the mean of its divisors is an integer number (2580749961).

Almost surely, 2^5161499921 is an apocalyptic number.

It is an amenable number.

5161499921 is a deficient number, since it is larger than the sum of its proper divisors (1).

5161499921 is an equidigital number, since it uses as much as digits as its factorization.

5161499921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 174960, while the sum is 47.

The square root of 5161499921 is about 71843.5795391627. The cubic root of 5161499921 is about 1728.1919387391.

The spelling of 5161499921 in words is "five billion, one hundred sixty-one million, four hundred ninety-nine thousand, nine hundred twenty-one".