3156921689 has 2 divisors, whose sum is σ = 3156921690. Its totient is φ = 3156921688.

The previous prime is 3156921661. The next prime is 3156921697. The reversal of 3156921689 is 9861296513.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3136896064 + 20025625 = 56008^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 3156921689 - 2¹² = 3156917593 is a prime.

It is a super-2 number, since 2×3156921689² = 19932309100957225442, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (3156921619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1578460844 + 1578460845.

It is an arithmetic number, because the mean of its divisors is an integer number (1578460845).

Almost surely, 2^3156921689 is an apocalyptic number.

It is an amenable number.

3156921689 is a deficient number, since it is larger than the sum of its proper divisors (1).

3156921689 is an equidigital number, since it uses as much as digits as its factorization.

3156921689 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 699840, while the sum is 50.

The square root of 3156921689 is about 56186.4902712387. The cubic root of 3156921689 is about 1466.9701254722.

The spelling of 3156921689 in words is "three billion, one hundred fifty-six million, nine hundred twenty-one thousand, six hundred eighty-nine".