10491990913 has 2 divisors, whose sum is σ = 10491990914. Its totient is φ = 10491990912.

The previous prime is 10491990857. The next prime is 10491990923. The reversal of 10491990913 is 31909919401.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 10487398464 + 4592449 = 102408^2 + 2143^2 .

It is a cyclic number.

It is not a de Polignac number, because 10491990913 - 2⁹ = 10491990401 is a prime.

It is a super-2 number, since 2×10491990913² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (10491990923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5245995456 + 5245995457.

It is an arithmetic number, because the mean of its divisors is an integer number (5245995457).

Almost surely, 2^10491990913 is an apocalyptic number.

It is an amenable number.

10491990913 is a deficient number, since it is larger than the sum of its proper divisors (1).

10491990913 is an equidigital number, since it uses as much as digits as its factorization.

10491990913 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 78732, while the sum is 46.

The spelling of 10491990913 in words is "ten billion, four hundred ninety-one million, nine hundred ninety thousand, nine hundred thirteen".