161674861 has 2 divisors, whose sum is σ = 161674862. Its totient is φ = 161674860.

The previous prime is 161674853. The next prime is 161674907. The reversal of 161674861 is 168476161.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159516900 + 2157961 = 12630^2 + 1469^2 .

It is a cyclic number.

It is not a de Polignac number, because 161674861 - 2³ = 161674853 is a prime.

It is a super-2 number, since 2×161674861² = 52277521358738642, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161674801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80837430 + 80837431.

It is an arithmetic number, because the mean of its divisors is an integer number (80837431).

Almost surely, 2^161674861 is an apocalyptic number.

It is an amenable number.

161674861 is a deficient number, since it is larger than the sum of its proper divisors (1).

161674861 is an equidigital number, since it uses as much as digits as its factorization.

161674861 is an evil number, because the sum of its binary digits is even.

The product of its digits is 48384, while the sum is 40.

The square root of 161674861 is about 12715.1429799275. The cubic root of 161674861 is about 544.7712318766.

The spelling of 161674861 in words is "one hundred sixty-one million, six hundred seventy-four thousand, eight hundred sixty-one".