161490520 has 16 divisors (see below), whose sum is σ = 363353760. Its totient is φ = 64596192.

The previous prime is 161490491. The next prime is 161490541. The reversal of 161490520 is 25094161.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2018592 + ... + 2018671.

It is an arithmetic number, because the mean of its divisors is an integer number (22709610).

Almost surely, 2^161490520 is an apocalyptic number.

161490520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161490520 is an abundant number, since it is smaller than the sum of its proper divisors (201863240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

161490520 is a wasteful number, since it uses less digits than its factorization.

161490520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4037274 (or 4037270 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 28.

The square root of 161490520 is about 12707.8920360538. The cubic root of 161490520 is about 544.5641045084.

The spelling of 161490520 in words is "one hundred sixty-one million, four hundred ninety thousand, five hundred twenty".