87240071291 has 4 divisors (see below), whose sum is σ = 87255379584. Its totient is φ = 87224763000.

The previous prime is 87240071273. The next prime is 87240071327. The reversal of 87240071291 is 19217004278.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 87240071291 - 2²⁶ = 87172962427 is a prime.

It is a super-2 number, since 2×87240071291² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (87240071201) 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, 7645595 + ... + 7656996.

It is an arithmetic number, because the mean of its divisors is an integer number (21813844896).

Almost surely, 2^87240071291 is an apocalyptic number.

87240071291 is a deficient number, since it is larger than the sum of its proper divisors (15308293).

87240071291 is a wasteful number, since it uses less digits than its factorization.

87240071291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15308292.

The product of its (nonzero) digits is 56448, while the sum is 41.

The spelling of 87240071291 in words is "eighty-seven billion, two hundred forty million, seventy-one thousand, two hundred ninety-one".