87194879 has 2 divisors, whose sum is σ = 87194880. Its totient is φ = 87194878.

The previous prime is 87194869. The next prime is 87194897. The reversal of 87194879 is 97849178.

Together with next prime (87194897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 87194879 - 2⁸ = 87194623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 87194879.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (87194869) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43597439 + 43597440.

It is an arithmetic number, because the mean of its divisors is an integer number (43597440).

Almost surely, 2^87194879 is an apocalyptic number.

87194879 is a deficient number, since it is larger than the sum of its proper divisors (1).

87194879 is an equidigital number, since it uses as much as digits as its factorization.

87194879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1016064, while the sum is 53.

The square root of 87194879 is about 9337.8198204934. The cubic root of 87194879 is about 443.4353653011.

The spelling of 87194879 in words is "eighty-seven million, one hundred ninety-four thousand, eight hundred seventy-nine".