2311548981 has 24 divisors (see below), whose sum is σ = 3594119040. Its totient is φ = 1317621312.

The previous prime is 2311548961. The next prime is 2311548983. The reversal of 2311548981 is 1898451132.

It is not a de Polignac number, because 2311548981 - 2⁷ = 2311548853 is a prime.

It is a super-2 number, since 2×2311548981² = 10686517383124276722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2311548983) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40900 + ... + 79346.

It is an arithmetic number, because the mean of its divisors is an integer number (149754960).

Almost surely, 2^2311548981 is an apocalyptic number.

2311548981 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2311548981 is a deficient number, since it is larger than the sum of its proper divisors (1282570059).

2311548981 is a wasteful number, since it uses less digits than its factorization.

2311548981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38873 (or 38866 counting only the distinct ones).

The product of its digits is 69120, while the sum is 42.

The square root of 2311548981 is about 48078.5709126218. The cubic root of 2311548981 is about 1322.2118146176.

The spelling of 2311548981 in words is "two billion, three hundred eleven million, five hundred forty-eight thousand, nine hundred eighty-one".