87198961 has 4 divisors (see below), whose sum is σ = 91788400. Its totient is φ = 82609524.

The previous prime is 87198941. The next prime is 87198977. The reversal of 87198961 is 16989178.

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 87198961 - 2⁵ = 87198929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87198941) 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, 2294691 + ... + 2294728.

It is an arithmetic number, because the mean of its divisors is an integer number (22947100).

Almost surely, 2^87198961 is an apocalyptic number.

It is an amenable number.

87198961 is a deficient number, since it is larger than the sum of its proper divisors (4589439).

87198961 is a wasteful number, since it uses less digits than its factorization.

87198961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4589438.

The product of its digits is 217728, while the sum is 49.

The square root of 87198961 is about 9338.0383914396. The cubic root of 87198961 is about 443.4422849541.

The spelling of 87198961 in words is "eighty-seven million, one hundred ninety-eight thousand, nine hundred sixty-one".