90101243077987 has 2 divisors, whose sum is σ = 90101243077988. Its totient is φ = 90101243077986.

The previous prime is 90101243077981. The next prime is 90101243078003. The reversal of 90101243077987 is 78977034210109.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-90101243077987 is a prime.

It is not a weakly prime, because it can be changed into another prime (90101243077981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45050621538993 + 45050621538994.

It is an arithmetic number, because the mean of its divisors is an integer number (45050621538994).

Almost surely, 2^{90101243077987} is an apocalyptic number.

90101243077987 is a deficient number, since it is larger than the sum of its proper divisors (1).

90101243077987 is an equidigital number, since it uses as much as digits as its factorization.

90101243077987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5334336, while the sum is 58.

The spelling of 90101243077987 in words is "ninety trillion, one hundred one billion, two hundred forty-three million, seventy-seven thousand, nine hundred eighty-seven".