11420139491 has 16 divisors (see below), whose sum is σ = 11668025184. Its totient is φ = 11175024384.

The previous prime is 11420139463. The next prime is 11420139517. The reversal of 11420139491 is 19493102411.

It is a cyclic number.

It is not a de Polignac number, because 11420139491 - 2⁶ = 11420139427 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (11420139421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11454005 + ... + 11455001.

It is an arithmetic number, because the mean of its divisors is an integer number (729251574).

Almost surely, 2^11420139491 is an apocalyptic number.

11420139491 is a deficient number, since it is larger than the sum of its proper divisors (247885693).

11420139491 is an equidigital number, since it uses as much as digits as its factorization.

11420139491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2150.

The product of its (nonzero) digits is 7776, while the sum is 35.

The spelling of 11420139491 in words is "eleven billion, four hundred twenty million, one hundred thirty-nine thousand, four hundred ninety-one".