161671579 has 2 divisors, whose sum is σ = 161671580. Its totient is φ = 161671578.

The previous prime is 161671511. The next prime is 161671583. The reversal of 161671579 is 975176161.

It is a strong prime.

It is an emirp because it is prime and its reverse (975176161) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 161671579 - 2¹⁵ = 161638811 is a prime.

It is a super-2 number, since 2×161671579² = 52275398912706482, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (161671379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80835789 + 80835790.

It is an arithmetic number, because the mean of its divisors is an integer number (80835790).

Almost surely, 2^161671579 is an apocalyptic number.

161671579 is a deficient number, since it is larger than the sum of its proper divisors (1).

161671579 is an equidigital number, since it uses as much as digits as its factorization.

161671579 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 79380, while the sum is 43.

The square root of 161671579 is about 12715.0139205586. The cubic root of 161671579 is about 544.7675455660.

The spelling of 161671579 in words is "one hundred sixty-one million, six hundred seventy-one thousand, five hundred seventy-nine".