161039887 has 4 divisors (see below), whose sum is σ = 161205696. Its totient is φ = 160874080.

The previous prime is 161039869. The next prime is 161039891. The reversal of 161039887 is 788930161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 788930161 = 7247 ⋅108863.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-161039887 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 (161039807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 81439 + ... + 83392.

It is an arithmetic number, because the mean of its divisors is an integer number (40301424).

Almost surely, 2^161039887 is an apocalyptic number.

161039887 is a deficient number, since it is larger than the sum of its proper divisors (165809).

161039887 is an equidigital number, since it uses as much as digits as its factorization.

161039887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 165808.

The product of its (nonzero) digits is 72576, while the sum is 43.

The square root of 161039887 is about 12690.1492111007. The cubic root of 161039887 is about 544.0571043266.

The spelling of 161039887 in words is "one hundred sixty-one million, thirty-nine thousand, eight hundred eighty-seven".