161690089 has 4 divisors (see below), whose sum is σ = 176389200. Its totient is φ = 146990980.

The previous prime is 161690063. The next prime is 161690099. The reversal of 161690089 is 980096161.

161690089 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161690089 is a prime.

It is a super-2 number, since 2×161690089² = 52287369761655842, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161690029) 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, 7349539 + ... + 7349560.

It is an arithmetic number, because the mean of its divisors is an integer number (44097300).

Almost surely, 2^161690089 is an apocalyptic number.

It is an amenable number.

161690089 is a deficient number, since it is larger than the sum of its proper divisors (14699111).

161690089 is a wasteful number, since it uses less digits than its factorization.

161690089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14699110.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 161690089 is about 12715.7417793851. The cubic root of 161690089 is about 544.7883351662.

The spelling of 161690089 in words is "one hundred sixty-one million, six hundred ninety thousand, eighty-nine".