161288990 has 16 divisors (see below), whose sum is σ = 290612448. Its totient is φ = 64450656.

The previous prime is 161288977. The next prime is 161288999. The reversal of 161288990 is 99882161.

161288990 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161288999) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3044 + ... + 18216.

It is an arithmetic number, because the mean of its divisors is an integer number (18163278).

Almost surely, 2^161288990 is an apocalyptic number.

161288990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

161288990 is a deficient number, since it is larger than the sum of its proper divisors (129323458).

161288990 is a wasteful number, since it uses less digits than its factorization.

161288990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16243.

The product of its (nonzero) digits is 62208, while the sum is 44.

The square root of 161288990 is about 12699.9602361582. The cubic root of 161288990 is about 544.3374829753.

The spelling of 161288990 in words is "one hundred sixty-one million, two hundred eighty-eight thousand, nine hundred ninety".