87231091 has 4 divisors (see below), whose sum is σ = 88282152. Its totient is φ = 86180032.

The previous prime is 87231073. The next prime is 87231103. The reversal of 87231091 is 19013278.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19013278 = 2 ⋅9506639.

It is a cyclic number.

It is not a de Polignac number, because 87231091 - 2⁵ = 87231059 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87231031) 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, 525406 + ... + 525571.

It is an arithmetic number, because the mean of its divisors is an integer number (22070538).

Almost surely, 2^87231091 is an apocalyptic number.

87231091 is a deficient number, since it is larger than the sum of its proper divisors (1051061).

87231091 is a wasteful number, since it uses less digits than its factorization.

87231091 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051060.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 87231091 is about 9339.7586157245. The cubic root of 87231091 is about 443.4967429845.

The spelling of 87231091 in words is "eighty-seven million, two hundred thirty-one thousand, ninety-one".