161868887 has 4 divisors (see below), whose sum is σ = 167090496. Its totient is φ = 156647280.

The previous prime is 161868881. The next prime is 161868901. The reversal of 161868887 is 788868161.

It is a happy number.

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 161868887 - 2⁸ = 161868631 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161868881) 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, 2610758 + ... + 2610819.

It is an arithmetic number, because the mean of its divisors is an integer number (41772624).

Almost surely, 2^161868887 is an apocalyptic number.

161868887 is a deficient number, since it is larger than the sum of its proper divisors (5221609).

161868887 is an equidigital number, since it uses as much as digits as its factorization.

161868887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5221608.

The product of its digits is 1032192, while the sum is 53.

The square root of 161868887 is about 12722.7704137110. The cubic root of 161868887 is about 544.9890714078.

The spelling of 161868887 in words is "one hundred sixty-one million, eight hundred sixty-eight thousand, eight hundred eighty-seven".