161675987 has 4 divisors (see below), whose sum is σ = 176373816. Its totient is φ = 146978160.

The previous prime is 161675981. The next prime is 161675999. The reversal of 161675987 is 789576161.

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 161675987 - 2⁴ = 161675971 is a prime.

It is a super-2 number, since 2×161675987² = 52278249544848338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (161675981) 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, 7348898 + ... + 7348919.

It is an arithmetic number, because the mean of its divisors is an integer number (44093454).

Almost surely, 2^161675987 is an apocalyptic number.

161675987 is a deficient number, since it is larger than the sum of its proper divisors (14697829).

161675987 is a wasteful number, since it uses less digits than its factorization.

161675987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14697828.

The product of its digits is 635040, while the sum is 50.

The square root of 161675987 is about 12715.1872577638. The cubic root of 161675987 is about 544.7724965775.

The spelling of 161675987 in words is "one hundred sixty-one million, six hundred seventy-five thousand, nine hundred eighty-seven".