101991292087 has 2 divisors, whose sum is σ = 101991292088. Its totient is φ = 101991292086.

The previous prime is 101991292061. The next prime is 101991292121. The reversal of 101991292087 is 780292199101.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 101991292087 - 2⁷ = 101991291959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101991292087.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101991292037) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50995646043 + 50995646044.

It is an arithmetic number, because the mean of its divisors is an integer number (50995646044).

Almost surely, 2^101991292087 is an apocalyptic number.

101991292087 is a deficient number, since it is larger than the sum of its proper divisors (1).

101991292087 is an equidigital number, since it uses as much as digits as its factorization.

101991292087 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 163296, while the sum is 49.

The spelling of 101991292087 in words is "one hundred one billion, nine hundred ninety-one million, two hundred ninety-two thousand, eighty-seven".