161591446 has 8 divisors (see below), whose sum is σ = 242653680. Its totient is φ = 80706888.

The previous prime is 161591431. The next prime is 161591449. The reversal of 161591446 is 644195161.

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

It is a super-2 number, since 2×161591446² = 52223590840741832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161591449) 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, 42121 + ... + 45796.

It is an arithmetic number, because the mean of its divisors is an integer number (30331710).

Almost surely, 2^161591446 is an apocalyptic number.

161591446 is a deficient number, since it is larger than the sum of its proper divisors (81062234).

161591446 is an equidigital number, since it uses as much as digits as its factorization.

161591446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 88838.

The product of its digits is 25920, while the sum is 37.

The square root of 161591446 is about 12711.8624127230. The cubic root of 161591446 is about 544.6775254722.

The spelling of 161591446 in words is "one hundred sixty-one million, five hundred ninety-one thousand, four hundred forty-six".