161386957 has 2 divisors, whose sum is σ = 161386958. Its totient is φ = 161386956.

The previous prime is 161386913. The next prime is 161387027. The reversal of 161386957 is 759683161.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 112232836 + 49154121 = 10594^2 + 7011^2 .

It is an emirp because it is prime and its reverse (759683161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161386957 - 2²⁷ = 27169229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161386157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80693478 + 80693479.

It is an arithmetic number, because the mean of its divisors is an integer number (80693479).

Almost surely, 2^161386957 is an apocalyptic number.

It is an amenable number.

161386957 is a deficient number, since it is larger than the sum of its proper divisors (1).

161386957 is an equidigital number, since it uses as much as digits as its factorization.

161386957 is an odious number, because the sum of its binary digits is odd.

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

The square root of 161386957 is about 12703.8166312333. The cubic root of 161386957 is about 544.4476709405.

The spelling of 161386957 in words is "one hundred sixty-one million, three hundred eighty-six thousand, nine hundred fifty-seven".