161956087 has 4 divisors (see below), whose sum is σ = 168997680. Its totient is φ = 154914496.

The previous prime is 161956079. The next prime is 161956111. The reversal of 161956087 is 780659161.

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 161956087 - 2³ = 161956079 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161956787) 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, 3520762 + ... + 3520807.

It is an arithmetic number, because the mean of its divisors is an integer number (42249420).

Almost surely, 2^161956087 is an apocalyptic number.

161956087 is a deficient number, since it is larger than the sum of its proper divisors (7041593).

161956087 is an equidigital number, since it uses as much as digits as its factorization.

161956087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7041592.

The product of its (nonzero) digits is 90720, while the sum is 43.

The square root of 161956087 is about 12726.1968788794. The cubic root of 161956087 is about 545.0869170918.

The spelling of 161956087 in words is "one hundred sixty-one million, nine hundred fifty-six thousand, eighty-seven".