87146791 has 4 divisors (see below), whose sum is σ = 87263584. Its totient is φ = 87030000.

The previous prime is 87146783. The next prime is 87146821. The reversal of 87146791 is 19764178.

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 87146791 - 2³ = 87146783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (87146291) 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, 57270 + ... + 58771.

It is an arithmetic number, because the mean of its divisors is an integer number (21815896).

Almost surely, 2^87146791 is an apocalyptic number.

87146791 is a deficient number, since it is larger than the sum of its proper divisors (116793).

87146791 is a wasteful number, since it uses less digits than its factorization.

87146791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116792.

The product of its digits is 84672, while the sum is 43.

The square root of 87146791 is about 9335.2445602673. The cubic root of 87146791 is about 443.3538320683.

The spelling of 87146791 in words is "eighty-seven million, one hundred forty-six thousand, seven hundred ninety-one".