152521921 has 2 divisors, whose sum is σ = 152521922. Its totient is φ = 152521920.

The previous prime is 152521883. The next prime is 152521939. The reversal of 152521921 is 129125251.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 151167025 + 1354896 = 12295^2 + 1164^2 .

It is a cyclic number.

It is not a de Polignac number, because 152521921 - 2¹³ = 152513729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 152521921.

It is not a weakly prime, because it can be changed into another prime (152521951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 76260960 + 76260961.

It is an arithmetic number, because the mean of its divisors is an integer number (76260961).

Almost surely, 2^152521921 is an apocalyptic number.

It is an amenable number.

152521921 is a deficient number, since it is larger than the sum of its proper divisors (1).

152521921 is an equidigital number, since it uses as much as digits as its factorization.

152521921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1800, while the sum is 28.

The square root of 152521921 is about 12349.9765586822. The cubic root of 152521921 is about 534.2904630176.

The spelling of 152521921 in words is "one hundred fifty-two million, five hundred twenty-one thousand, nine hundred twenty-one".