161379391 has 2 divisors, whose sum is σ = 161379392. Its totient is φ = 161379390.

The previous prime is 161379371. The next prime is 161379409. The reversal of 161379391 is 193973161.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161379391 - 2⁵ = 161379359 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161379371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80689695 + 80689696.

It is an arithmetic number, because the mean of its divisors is an integer number (80689696).

Almost surely, 2^161379391 is an apocalyptic number.

161379391 is a deficient number, since it is larger than the sum of its proper divisors (1).

161379391 is an equidigital number, since it uses as much as digits as its factorization.

161379391 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 40.

The square root of 161379391 is about 12703.5188432182. The cubic root of 161379391 is about 544.4391627035.

The spelling of 161379391 in words is "one hundred sixty-one million, three hundred seventy-nine thousand, three hundred ninety-one".