161686087 has 4 divisors (see below), whose sum is σ = 161712216. Its totient is φ = 161659960.

The previous prime is 161686081. The next prime is 161686117. The reversal of 161686087 is 780686161.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 161686087 - 2³ = 161686079 is a prime.

It is a super-2 number, since 2×161686087² = 52284781458743138, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161686081) 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, 2037 + ... + 18097.

It is an arithmetic number, because the mean of its divisors is an integer number (40428054).

Almost surely, 2^161686087 is an apocalyptic number.

161686087 is a deficient number, since it is larger than the sum of its proper divisors (26129).

161686087 is a wasteful number, since it uses less digits than its factorization.

161686087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26128.

The product of its (nonzero) digits is 96768, while the sum is 43.

The square root of 161686087 is about 12715.5844144105. The cubic root of 161686087 is about 544.7838404341.

The spelling of 161686087 in words is "one hundred sixty-one million, six hundred eighty-six thousand, eighty-seven".