161901495 has 48 divisors (see below), whose sum is σ = 322470720. Its totient is φ = 73608192.

The previous prime is 161901491. The next prime is 161901533. The reversal of 161901495 is 594109161.

161901495 is a `hidden beast` number, since 161 + 9 + 0 + 1 + 495 = 666.

It is not a de Polignac number, because 161901495 - 2² = 161901491 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161901491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 60751 + ... + 63359.

It is an arithmetic number, because the mean of its divisors is an integer number (6718140).

Almost surely, 2^161901495 is an apocalyptic number.

161901495 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

161901495 is a deficient number, since it is larger than the sum of its proper divisors (160569225).

161901495 is a wasteful number, since it uses less digits than its factorization.

161901495 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2824 (or 2821 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 36.

The square root of 161901495 is about 12724.0518310796. The cubic root of 161901495 is about 545.0256644200.

The spelling of 161901495 in words is "one hundred sixty-one million, nine hundred one thousand, four hundred ninety-five".