10491439291 has 12 divisors (see below), whose sum is σ = 10661453712. Its totient is φ = 10324011984.

The previous prime is 10491439261. The next prime is 10491439303. The reversal of 10491439291 is 19293419401.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-10491439291 is a prime.

It is a super-2 number, since 2×10491439291² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (10491439241) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1975746 + ... + 1981048.

It is an arithmetic number, because the mean of its divisors is an integer number (888454476).

Almost surely, 2^10491439291 is an apocalyptic number.

10491439291 is a deficient number, since it is larger than the sum of its proper divisors (170014421).

10491439291 is an frugal number, since it uses more digits than its factorization.

10491439291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5778 (or 5699 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 43.

The spelling of 10491439291 in words is "ten billion, four hundred ninety-one million, four hundred thirty-nine thousand, two hundred ninety-one".