161611442 has 8 divisors (see below), whose sum is σ = 243011100. Its totient is φ = 80607744.

The previous prime is 161611423. The next prime is 161611447. The reversal of 161611442 is 244116161.

It can be written as a sum of positive squares in 2 ways, for example, as 125238481 + 36372961 = 11191^2 + 6031^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×161611442² = 52236516370638728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (161611447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97967 + ... + 99602.

Almost surely, 2^161611442 is an apocalyptic number.

161611442 is a deficient number, since it is larger than the sum of its proper divisors (81399658).

161611442 is a wasteful number, since it uses less digits than its factorization.

161611442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197980.

The product of its digits is 1152, while the sum is 26.

The square root of 161611442 is about 12712.6488978497. The cubic root of 161611442 is about 544.6999914357.

The spelling of 161611442 in words is "one hundred sixty-one million, six hundred eleven thousand, four hundred forty-two".