2991256923 has 4 divisors (see below), whose sum is σ = 3988342568. Its totient is φ = 1994171280.

The previous prime is 2991256907. The next prime is 2991256937. The reversal of 2991256923 is 3296521992.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 2991256923 - 2⁴ = 2991256907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2991256993) 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, 498542818 + ... + 498542823.

It is an arithmetic number, because the mean of its divisors is an integer number (997085642).

Almost surely, 2^2991256923 is an apocalyptic number.

2991256923 is a deficient number, since it is larger than the sum of its proper divisors (997085645).

2991256923 is an equidigital number, since it uses as much as digits as its factorization.

2991256923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997085644.

The product of its digits is 524880, while the sum is 48.

The square root of 2991256923 is about 54692.3845064375. The cubic root of 2991256923 is about 1440.8471293465.

The spelling of 2991256923 in words is "two billion, nine hundred ninety-one million, two hundred fifty-six thousand, nine hundred twenty-three".