161455587 has 4 divisors (see below), whose sum is σ = 215274120. Its totient is φ = 107637056.

The previous prime is 161455573. The next prime is 161455601. The reversal of 161455587 is 785554161.

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

It is an interprime number because it is at equal distance from previous prime (161455573) and next prime (161455601).

It is a cyclic number.

It is not a de Polignac number, because 161455587 - 2⁴ = 161455571 is a prime.

It is not an unprimeable number, because it can be changed into a prime (161455187) 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, 26909262 + ... + 26909267.

It is an arithmetic number, because the mean of its divisors is an integer number (53818530).

Almost surely, 2^161455587 is an apocalyptic number.

161455587 is a deficient number, since it is larger than the sum of its proper divisors (53818533).

161455587 is an equidigital number, since it uses as much as digits as its factorization.

161455587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53818532.

The product of its digits is 168000, while the sum is 42.

The square root of 161455587 is about 12706.5175008733. The cubic root of 161455587 is about 544.5248356818.

The spelling of 161455587 in words is "one hundred sixty-one million, four hundred fifty-five thousand, five hundred eighty-seven".