161491358 has 12 divisors (see below), whose sum is σ = 281786112. Its totient is φ = 69210540.

The previous prime is 161491289. The next prime is 161491361. The reversal of 161491358 is 853194161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 823838 + ... + 824033.

It is an arithmetic number, because the mean of its divisors is an integer number (23482176).

Almost surely, 2^161491358 is an apocalyptic number.

161491358 is a deficient number, since it is larger than the sum of its proper divisors (120294754).

161491358 is a wasteful number, since it uses less digits than its factorization.

161491358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1647887 (or 1647880 counting only the distinct ones).

The product of its digits is 25920, while the sum is 38.

The square root of 161491358 is about 12707.9250076478. The cubic root of 161491358 is about 544.5650464501.

The spelling of 161491358 in words is "one hundred sixty-one million, four hundred ninety-one thousand, three hundred fifty-eight".