2170968157 has 2 divisors, whose sum is σ = 2170968158. Its totient is φ = 2170968156.

The previous prime is 2170968113. The next prime is 2170968167. The reversal of 2170968157 is 7518690712.

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., 1774599876 + 396368281 = 42126^2 + 19909^2 .

It is a cyclic number.

It is not a de Polignac number, because 2170968157 - 2⁷ = 2170968029 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2170968167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085484078 + 1085484079.

It is an arithmetic number, because the mean of its divisors is an integer number (1085484079).

Almost surely, 2^2170968157 is an apocalyptic number.

It is an amenable number.

2170968157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2170968157 is an equidigital number, since it uses as much as digits as its factorization.

2170968157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 46.

The square root of 2170968157 is about 46593.6493204814. The cubic root of 2170968157 is about 1294.8451004582.

The spelling of 2170968157 in words is "two billion, one hundred seventy million, nine hundred sixty-eight thousand, one hundred fifty-seven".