2151398939 has 2 divisors, whose sum is σ = 2151398940. Its totient is φ = 2151398938.

The previous prime is 2151398857. The next prime is 2151398941. The reversal of 2151398939 is 9398931512.

It is a happy number.

2151398939 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2151398939 - 2¹⁶ = 2151333403 is a prime.

Together with 2151398941, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2151398969) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1075699469 + 1075699470.

It is an arithmetic number, because the mean of its divisors is an integer number (1075699470).

Almost surely, 2^2151398939 is an apocalyptic number.

2151398939 is a deficient number, since it is larger than the sum of its proper divisors (1).

2151398939 is an equidigital number, since it uses as much as digits as its factorization.

2151398939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 524880, while the sum is 50.

The square root of 2151398939 is about 46383.1751716072. The cubic root of 2151398939 is about 1290.9427515537.

The spelling of 2151398939 in words is "two billion, one hundred fifty-one million, three hundred ninety-eight thousand, nine hundred thirty-nine".