161928087 has 4 divisors (see below), whose sum is σ = 215904120. Its totient is φ = 107952056.

The previous prime is 161928061. The next prime is 161928101. The reversal of 161928087 is 780829161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 161928087 - 2¹⁴ = 161911703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161928007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26988012 + ... + 26988017.

It is an arithmetic number, because the mean of its divisors is an integer number (53976030).

Almost surely, 2^161928087 is an apocalyptic number.

161928087 is a deficient number, since it is larger than the sum of its proper divisors (53976033).

161928087 is an equidigital number, since it uses as much as digits as its factorization.

161928087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53976032.

The product of its (nonzero) digits is 48384, while the sum is 42.

The square root of 161928087 is about 12725.0967383356. The cubic root of 161928087 is about 545.0555025819.

The spelling of 161928087 in words is "one hundred sixty-one million, nine hundred twenty-eight thousand, eighty-seven".