87636912091 has 2 divisors, whose sum is σ = 87636912092. Its totient is φ = 87636912090.

The previous prime is 87636912047. The next prime is 87636912119. The reversal of 87636912091 is 19021963678.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 87636912091 - 2¹¹ = 87636910043 is a prime.

It is not a weakly prime, because it can be changed into another prime (87636912001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 43818456045 + 43818456046.

It is an arithmetic number, because the mean of its divisors is an integer number (43818456046).

Almost surely, 2^87636912091 is an apocalyptic number.

87636912091 is a deficient number, since it is larger than the sum of its proper divisors (1).

87636912091 is an equidigital number, since it uses as much as digits as its factorization.

87636912091 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 87636912091 in words is "eighty-seven billion, six hundred thirty-six million, nine hundred twelve thousand, ninety-one".