161636413 has 2 divisors, whose sum is σ = 161636414. Its totient is φ = 161636412.

The previous prime is 161636411. The next prime is 161636467. The reversal of 161636413 is 314636161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 160858489 + 777924 = 12683^2 + 882^2 .

It is a cyclic number.

It is not a de Polignac number, because 161636413 - 2¹ = 161636411 is a prime.

It is a super-2 number, since 2×161636413² = 52252660015013138, which contains 22 as substring.

Together with 161636411, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161636411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80818206 + 80818207.

It is an arithmetic number, because the mean of its divisors is an integer number (80818207).

Almost surely, 2^161636413 is an apocalyptic number.

It is an amenable number.

161636413 is a deficient number, since it is larger than the sum of its proper divisors (1).

161636413 is an equidigital number, since it uses as much as digits as its factorization.

161636413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 7776, while the sum is 31.

The square root of 161636413 is about 12713.6309919708. The cubic root of 161636413 is about 544.7280443236.

The spelling of 161636413 in words is "one hundred sixty-one million, six hundred thirty-six thousand, four hundred thirteen".