161674493 has 2 divisors, whose sum is σ = 161674494. Its totient is φ = 161674492.

The previous prime is 161674399. The next prime is 161674519. The reversal of 161674493 is 394476161.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 102353689 + 59320804 = 10117^2 + 7702^2 .

It is a cyclic number.

It is not a de Polignac number, because 161674493 - 2²⁶ = 94565629 is a prime.

It is a super-2 number, since 2×161674493² = 52277283373614098, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 161674493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (191674493) 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, 80837246 + 80837247.

It is an arithmetic number, because the mean of its divisors is an integer number (80837247).

Almost surely, 2^161674493 is an apocalyptic number.

It is an amenable number.

161674493 is a deficient number, since it is larger than the sum of its proper divisors (1).

161674493 is an equidigital number, since it uses as much as digits as its factorization.

161674493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 41.

The square root of 161674493 is about 12715.1285089849. The cubic root of 161674493 is about 544.7708185451.

The spelling of 161674493 in words is "one hundred sixty-one million, six hundred seventy-four thousand, four hundred ninety-three".