161957077 has 2 divisors, whose sum is σ = 161957078. Its totient is φ = 161957076.

The previous prime is 161957071. The next prime is 161957087. The reversal of 161957077 is 770759161.

It is a happy number.

161957077 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159542161 + 2414916 = 12631^2 + 1554^2 .

It is an emirp because it is prime and its reverse (770759161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161957077 - 2³ = 161957069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161957071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80978538 + 80978539.

It is an arithmetic number, because the mean of its divisors is an integer number (80978539).

Almost surely, 2^161957077 is an apocalyptic number.

It is an amenable number.

161957077 is a deficient number, since it is larger than the sum of its proper divisors (1).

161957077 is an equidigital number, since it uses as much as digits as its factorization.

161957077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 92610, while the sum is 43.

The square root of 161957077 is about 12726.2357749650. The cubic root of 161957077 is about 545.0880277529.

The spelling of 161957077 in words is "one hundred sixty-one million, nine hundred fifty-seven thousand, seventy-seven".