161674399 has 2 divisors, whose sum is σ = 161674400. Its totient is φ = 161674398.

The previous prime is 161674379. The next prime is 161674493. The reversal of 161674399 is 993476161.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 161674399 - 2²³ = 153285791 is a prime.

It is a super-2 number, since 2×161674399² = 52277222584022402, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161674309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80837199 + 80837200.

It is an arithmetic number, because the mean of its divisors is an integer number (80837200).

Almost surely, 2^161674399 is an apocalyptic number.

161674399 is a deficient number, since it is larger than the sum of its proper divisors (1).

161674399 is an equidigital number, since it uses as much as digits as its factorization.

161674399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 244944, while the sum is 46.

The square root of 161674399 is about 12715.1248126002. The cubic root of 161674399 is about 544.7707129657.

The spelling of 161674399 in words is "one hundred sixty-one million, six hundred seventy-four thousand, three hundred ninety-nine".