161108902 has 4 divisors (see below), whose sum is σ = 241663356. Its totient is φ = 80554450.

The previous prime is 161108863. The next prime is 161108921. The reversal of 161108902 is 209801161.

It is a happy number.

161108902 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 an emirpimes, since its reverse is a distinct semiprime: 209801161 = 7963 ⋅26347.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40277224 + ... + 40277227.

It is an arithmetic number, because the mean of its divisors is an integer number (60415839).

Almost surely, 2^161108902 is an apocalyptic number.

161108902 is a deficient number, since it is larger than the sum of its proper divisors (80554454).

161108902 is an equidigital number, since it uses as much as digits as its factorization.

161108902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 80554453.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 161108902 is about 12692.8681549916. The cubic root of 161108902 is about 544.1348133116.

The spelling of 161108902 in words is "one hundred sixty-one million, one hundred eight thousand, nine hundred two".