161313890 has 32 divisors (see below), whose sum is σ = 299605824. Its totient is φ = 62504640.

The previous prime is 161313883. The next prime is 161313913. The reversal of 161313890 is 98313161.

161313890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161313890² = 52044342213864200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38897 + ... + 42843.

It is an arithmetic number, because the mean of its divisors is an integer number (9362682).

Almost surely, 2^161313890 is an apocalyptic number.

161313890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161313890 is a deficient number, since it is larger than the sum of its proper divisors (138291934).

161313890 is a wasteful number, since it uses less digits than its factorization.

161313890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 161313890 is about 12700.9405163555. The cubic root of 161313890 is about 544.3654933722.

The spelling of 161313890 in words is "one hundred sixty-one million, three hundred thirteen thousand, eight hundred ninety".