2152621969 has 2 divisors, whose sum is σ = 2152621970. Its totient is φ = 2152621968.

The previous prime is 2152621951. The next prime is 2152621973. The reversal of 2152621969 is 9691262512.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1735972225 + 416649744 = 41665^2 + 20412^2 .

It is a cyclic number.

It is not a de Polignac number, because 2152621969 - 2⁵ = 2152621937 is a prime.

It is a super-2 number, since 2×2152621969² = 9267562682842873922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2152621909) 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 as a sum of consecutive naturals, namely, 1076310984 + 1076310985.

It is an arithmetic number, because the mean of its divisors is an integer number (1076310985).

Almost surely, 2^2152621969 is an apocalyptic number.

It is an amenable number.

2152621969 is a deficient number, since it is larger than the sum of its proper divisors (1).

2152621969 is an equidigital number, since it uses as much as digits as its factorization.

2152621969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 116640, while the sum is 43.

The square root of 2152621969 is about 46396.3572815798. The cubic root of 2152621969 is about 1291.1873308047.

The spelling of 2152621969 in words is "two billion, one hundred fifty-two million, six hundred twenty-one thousand, nine hundred sixty-nine".