23831890649 has 4 divisors (see below), whose sum is σ = 27236446464. Its totient is φ = 20427334836.

The previous prime is 23831890619. The next prime is 23831890669. The reversal of 23831890649 is 94609813832.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 23831890649 - 2⁸ = 23831890393 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 23831890649.

It is not an unprimeable number, because it can be changed into a prime (23831890619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1702277897 + ... + 1702277910.

It is an arithmetic number, because the mean of its divisors is an integer number (6809111616).

Almost surely, 2^23831890649 is an apocalyptic number.

It is an amenable number.

23831890649 is a deficient number, since it is larger than the sum of its proper divisors (3404555815).

23831890649 is an equidigital number, since it uses as much as digits as its factorization.

23831890649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3404555814.

The product of its (nonzero) digits is 2239488, while the sum is 53.

The spelling of 23831890649 in words is "twenty-three billion, eight hundred thirty-one million, eight hundred ninety thousand, six hundred forty-nine".