161310613 has 2 divisors, whose sum is σ = 161310614. Its totient is φ = 161310612.

The previous prime is 161310601. The next prime is 161310623. The reversal of 161310613 is 316013161.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 109369764 + 51940849 = 10458^2 + 7207^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161310613 is a prime.

It is a super-2 number, since 2×161310613² = 52042227732871538, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161310623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80655306 + 80655307.

It is an arithmetic number, because the mean of its divisors is an integer number (80655307).

Almost surely, 2^161310613 is an apocalyptic number.

It is an amenable number.

161310613 is a deficient number, since it is larger than the sum of its proper divisors (1).

161310613 is an equidigital number, since it uses as much as digits as its factorization.

161310613 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 161310613 is about 12700.8115095060. The cubic root of 161310613 is about 544.3618071887.

Adding to 161310613 its reverse (316013161), we get a palindrome (477323774).

The spelling of 161310613 in words is "one hundred sixty-one million, three hundred ten thousand, six hundred thirteen".