161551087 has 2 divisors, whose sum is σ = 161551088. Its totient is φ = 161551086.

The previous prime is 161551073. The next prime is 161551097. The reversal of 161551087 is 780155161.

161551087 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 161551087 - 2¹⁹ = 161026799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (161551037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80775543 + 80775544.

It is an arithmetic number, because the mean of its divisors is an integer number (80775544).

Almost surely, 2^161551087 is an apocalyptic number.

161551087 is a deficient number, since it is larger than the sum of its proper divisors (1).

161551087 is an equidigital number, since it uses as much as digits as its factorization.

161551087 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8400, while the sum is 34.

The square root of 161551087 is about 12710.2748593412. The cubic root of 161551087 is about 544.6321755663.

The spelling of 161551087 in words is "one hundred sixty-one million, five hundred fifty-one thousand, eighty-seven".