84087491 has 4 divisors (see below), whose sum is σ = 89033832. Its totient is φ = 79141152.

The previous prime is 84087427. The next prime is 84087499. The reversal of 84087491 is 19478048.

It is a happy number.

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 84087491 - 2⁶ = 84087427 is a prime.

It is a super-2 number, since 2×84087491² = 14141412285350162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (84087499) 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, 2473145 + ... + 2473178.

It is an arithmetic number, because the mean of its divisors is an integer number (22258458).

Almost surely, 2^84087491 is an apocalyptic number.

84087491 is a deficient number, since it is larger than the sum of its proper divisors (4946341).

84087491 is a wasteful number, since it uses less digits than its factorization.

84087491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4946340.

The product of its (nonzero) digits is 64512, while the sum is 41.

The square root of 84087491 is about 9169.9231730697. The cubic root of 84087491 is about 438.1039122249.

The spelling of 84087491 in words is "eighty-four million, eighty-seven thousand, four hundred ninety-one".