1010100991 has 2 divisors, whose sum is σ = 1010100992. Its totient is φ = 1010100990.

The previous prime is 1010100983. The next prime is 1010101007. The reversal of 1010100991 is 1990010101.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1010100991 - 2³ = 1010100983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1010100391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505050495 + 505050496.

It is an arithmetic number, because the mean of its divisors is an integer number (505050496).

Almost surely, 2^1010100991 is an apocalyptic number.

1010100991 is a deficient number, since it is larger than the sum of its proper divisors (1).

1010100991 is an equidigital number, since it uses as much as digits as its factorization.

1010100991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 81, while the sum is 22.

The square root of 1010100991 is about 31782.0860076868. The cubic root of 1010100991 is about 1003.3557235235.

The spelling of 1010100991 in words is "one billion, ten million, one hundred thousand, nine hundred ninety-one".