2190099991 has 2 divisors, whose sum is σ = 2190099992. Its totient is φ = 2190099990.

The previous prime is 2190099949. The next prime is 2190100013. The reversal of 2190099991 is 1999900912.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2190099991 - 2⁹ = 2190099479 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2190091991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1095049995 + 1095049996.

It is an arithmetic number, because the mean of its divisors is an integer number (1095049996).

Almost surely, 2^2190099991 is an apocalyptic number.

2190099991 is a deficient number, since it is larger than the sum of its proper divisors (1).

2190099991 is an equidigital number, since it uses as much as digits as its factorization.

2190099991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 118098, while the sum is 49.

The square root of 2190099991 is about 46798.5041534449. The cubic root of 2190099991 is about 1298.6376242336.

The spelling of 2190099991 in words is "two billion, one hundred ninety million, ninety-nine thousand, nine hundred ninety-one".