161923492 has 6 divisors (see below), whose sum is σ = 283366118. Its totient is φ = 80961744.

The previous prime is 161923483. The next prime is 161923493. The reversal of 161923492 is 294329161.

It can be written as a sum of positive squares in only one way, i.e., 148498596 + 13424896 = 12186^2 + 3664^2 .

It is a super-2 number, since 2×161923492² = 52438434522948128, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161923493) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20240433 + ... + 20240440.

Almost surely, 2^161923492 is an apocalyptic number.

It is an amenable number.

161923492 is a deficient number, since it is larger than the sum of its proper divisors (121442626).

161923492 is a wasteful number, since it uses less digits than its factorization.

161923492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40480877 (or 40480875 counting only the distinct ones).

The product of its digits is 23328, while the sum is 37.

The square root of 161923492 is about 12724.9161883291. The cubic root of 161923492 is about 545.0503468905.

The spelling of 161923492 in words is "one hundred sixty-one million, nine hundred twenty-three thousand, four hundred ninety-two".