161670137 has 2 divisors, whose sum is σ = 161670138. Its totient is φ = 161670136.

The previous prime is 161670127. The next prime is 161670203. The reversal of 161670137 is 731076161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 154157056 + 7513081 = 12416^2 + 2741^2 .

It is an emirp because it is prime and its reverse (731076161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161670137 - 2⁴ = 161670121 is a prime.

It is a super-2 number, since 2×161670137² = 52274466395197538, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161670127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80835068 + 80835069.

It is an arithmetic number, because the mean of its divisors is an integer number (80835069).

Almost surely, 2^161670137 is an apocalyptic number.

It is an amenable number.

161670137 is a deficient number, since it is larger than the sum of its proper divisors (1).

161670137 is an equidigital number, since it uses as much as digits as its factorization.

161670137 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5292, while the sum is 32.

The square root of 161670137 is about 12714.9572158148. The cubic root of 161670137 is about 544.7659259098.

The spelling of 161670137 in words is "one hundred sixty-one million, six hundred seventy thousand, one hundred thirty-seven".