161306377 has 2 divisors, whose sum is σ = 161306378. Its totient is φ = 161306376.

The previous prime is 161306351. The next prime is 161306389. The reversal of 161306377 is 773603161.

It is a happy number.

161306377 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 can be written as a sum of positive squares in only one way, i.e., 160503561 + 802816 = 12669^2 + 896^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161306377 is a prime.

It is a super-2 number, since 2×161306377² = 52039494521732258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161306477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80653188 + 80653189.

It is an arithmetic number, because the mean of its divisors is an integer number (80653189).

Almost surely, 2^161306377 is an apocalyptic number.

It is an amenable number.

161306377 is a deficient number, since it is larger than the sum of its proper divisors (1).

161306377 is an equidigital number, since it uses as much as digits as its factorization.

161306377 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15876, while the sum is 34.

The square root of 161306377 is about 12700.6447474134. The cubic root of 161306377 is about 544.3570421854.

The spelling of 161306377 in words is "one hundred sixty-one million, three hundred six thousand, three hundred seventy-seven".