161974247 has 2 divisors, whose sum is σ = 161974248. Its totient is φ = 161974246.

The previous prime is 161974237. The next prime is 161974273. The reversal of 161974247 is 742479161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161974247 - 2²⁰ = 160925671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161974207) 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, 80987123 + 80987124.

It is an arithmetic number, because the mean of its divisors is an integer number (80987124).

Almost surely, 2^161974247 is an apocalyptic number.

161974247 is a deficient number, since it is larger than the sum of its proper divisors (1).

161974247 is an equidigital number, since it uses as much as digits as its factorization.

161974247 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 41.

The square root of 161974247 is about 12726.9103477631. The cubic root of 161974247 is about 545.1072897098.

The spelling of 161974247 in words is "one hundred sixty-one million, nine hundred seventy-four thousand, two hundred forty-seven".