161953087 has 4 divisors (see below), whose sum is σ = 163025776. Its totient is φ = 160880400.

The previous prime is 161953061. The next prime is 161953133. The reversal of 161953087 is 780359161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 780359161 = 653 ⋅1195037.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161953087 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161953037) 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 3 ways as a sum of consecutive naturals, for example, 536118 + ... + 536419.

It is an arithmetic number, because the mean of its divisors is an integer number (40756444).

Almost surely, 2^161953087 is an apocalyptic number.

161953087 is a deficient number, since it is larger than the sum of its proper divisors (1072689).

161953087 is a wasteful number, since it uses less digits than its factorization.

161953087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072688.

The product of its (nonzero) digits is 45360, while the sum is 40.

The square root of 161953087 is about 12726.0790112273. The cubic root of 161953087 is about 545.0835514247.

The spelling of 161953087 in words is "one hundred sixty-one million, nine hundred fifty-three thousand, eighty-seven".