163961857 has 2 divisors, whose sum is σ = 163961858. Its totient is φ = 163961856.

The previous prime is 163961801. The next prime is 163961879. The reversal of 163961857 is 758169361.

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., 163814401 + 147456 = 12799^2 + 384^2 .

It is a cyclic number.

It is not a de Polignac number, because 163961857 - 2⁷ = 163961729 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (163961257) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81980928 + 81980929.

It is an arithmetic number, because the mean of its divisors is an integer number (81980929).

Almost surely, 2^163961857 is an apocalyptic number.

It is an amenable number.

163961857 is a deficient number, since it is larger than the sum of its proper divisors (1).

163961857 is an equidigital number, since it uses as much as digits as its factorization.

163961857 is an evil number, because the sum of its binary digits is even.

The product of its digits is 272160, while the sum is 46.

The square root of 163961857 is about 12804.7591543145. The cubic root of 163961857 is about 547.3279285230.

The spelling of 163961857 in words is "one hundred sixty-three million, nine hundred sixty-one thousand, eight hundred fifty-seven".