87091161 has 4 divisors (see below), whose sum is σ = 116121552. Its totient is φ = 58060772.

The previous prime is 87091157. The next prime is 87091163. The reversal of 87091161 is 16119078.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 87091161 - 2² = 87091157 is a prime.

It is not an unprimeable number, because it can be changed into a prime (87091163) 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, 14515191 + ... + 14515196.

It is an arithmetic number, because the mean of its divisors is an integer number (29030388).

Almost surely, 2^87091161 is an apocalyptic number.

It is an amenable number.

87091161 is a deficient number, since it is larger than the sum of its proper divisors (29030391).

87091161 is a wasteful number, since it uses less digits than its factorization.

87091161 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29030390.

The product of its (nonzero) digits is 3024, while the sum is 33.

The square root of 87091161 is about 9332.2645161826. The cubic root of 87091161 is about 443.2594739426.

It can be divided in two parts, 8709 and 1161, that added together give a triangular number (9870 = T₁₄₀).

The spelling of 87091161 in words is "eighty-seven million, ninety-one thousand, one hundred sixty-one".