161236913 has 2 divisors, whose sum is σ = 161236914. Its totient is φ = 161236912.

The previous prime is 161236853. The next prime is 161236919. The reversal of 161236913 is 319632161.

161236913 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., 161213809 + 23104 = 12697^2 + 152^2 .

It is a cyclic number.

It is not a de Polignac number, because 161236913 - 2⁶ = 161236849 is a prime.

It is a super-2 number, since 2×161236913² = 51994684227539138, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 161236913.

It is not a weakly prime, because it can be changed into another prime (161236919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80618456 + 80618457.

It is an arithmetic number, because the mean of its divisors is an integer number (80618457).

Almost surely, 2^161236913 is an apocalyptic number.

It is an amenable number.

161236913 is a deficient number, since it is larger than the sum of its proper divisors (1).

161236913 is an equidigital number, since it uses as much as digits as its factorization.

161236913 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5832, while the sum is 32.

The square root of 161236913 is about 12697.9097886227. The cubic root of 161236913 is about 544.2788914277.

The spelling of 161236913 in words is "one hundred sixty-one million, two hundred thirty-six thousand, nine hundred thirteen".