161874511 has 2 divisors, whose sum is σ = 161874512. Its totient is φ = 161874510.

The previous prime is 161874497. The next prime is 161874539. The reversal of 161874511 is 115478161.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161874511 - 2²⁵ = 128320079 is a prime.

It is a super-2 number, since 2×161874511² = 52406714622978242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161874551) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80937255 + 80937256.

It is an arithmetic number, because the mean of its divisors is an integer number (80937256).

Almost surely, 2^161874511 is an apocalyptic number.

161874511 is a deficient number, since it is larger than the sum of its proper divisors (1).

161874511 is an equidigital number, since it uses as much as digits as its factorization.

161874511 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6720, while the sum is 34.

The square root of 161874511 is about 12722.9914328353. The cubic root of 161874511 is about 544.9953830656.

The spelling of 161874511 in words is "one hundred sixty-one million, eight hundred seventy-four thousand, five hundred eleven".