161961379 has 2 divisors, whose sum is σ = 161961380. Its totient is φ = 161961378.

The previous prime is 161961353. The next prime is 161961409. The reversal of 161961379 is 973169161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161961379 - 2⁷ = 161961251 is a prime.

It is not a weakly prime, because it can be changed into another prime (161961179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80980689 + 80980690.

It is an arithmetic number, because the mean of its divisors is an integer number (80980690).

Almost surely, 2^161961379 is an apocalyptic number.

161961379 is a deficient number, since it is larger than the sum of its proper divisors (1).

161961379 is an equidigital number, since it uses as much as digits as its factorization.

161961379 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 161961379 is about 12726.4047947565. The cubic root of 161961379 is about 545.0928540274.

The spelling of 161961379 in words is "one hundred sixty-one million, nine hundred sixty-one thousand, three hundred seventy-nine".