87975691 has 2 divisors, whose sum is σ = 87975692. Its totient is φ = 87975690.

The previous prime is 87975659. The next prime is 87975703. The reversal of 87975691 is 19657978.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87975691 - 2⁵ = 87975659 is a prime.

It is not a weakly prime, because it can be changed into another prime (87975091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43987845 + 43987846.

It is an arithmetic number, because the mean of its divisors is an integer number (43987846).

Almost surely, 2^87975691 is an apocalyptic number.

87975691 is a deficient number, since it is larger than the sum of its proper divisors (1).

87975691 is an equidigital number, since it uses as much as digits as its factorization.

87975691 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 952560, while the sum is 52.

The square root of 87975691 is about 9379.5357561022. The cubic root of 87975691 is about 444.7550577268.

The spelling of 87975691 in words is "eighty-seven million, nine hundred seventy-five thousand, six hundred ninety-one".