101500991 has 2 divisors, whose sum is σ = 101500992. Its totient is φ = 101500990.

The previous prime is 101500981. The next prime is 101501009. The reversal of 101500991 is 199005101.

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-101500991 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 101500991.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101500921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50750495 + 50750496.

It is an arithmetic number, because the mean of its divisors is an integer number (50750496).

Almost surely, 2^101500991 is an apocalyptic number.

101500991 is a deficient number, since it is larger than the sum of its proper divisors (1).

101500991 is an equidigital number, since it uses as much as digits as its factorization.

101500991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 405, while the sum is 26.

The square root of 101500991 is about 10074.7700221891. The cubic root of 101500991 is about 466.4696876723.

The spelling of 101500991 in words is "one hundred one million, five hundred thousand, nine hundred ninety-one".