1023111981 has 24 divisors (see below), whose sum is σ = 1556990240. Its totient is φ = 645602400.

The previous prime is 1023111959. The next prime is 1023111983. The reversal of 1023111981 is 1891113201.

It is not a de Polignac number, because 1023111981 - 2⁷ = 1023111853 is a prime.

It is a super-2 number, since 2×1023111981² = 2093516251331488722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1023111983) 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, 275346 + ... + 279036.

Almost surely, 2^1023111981 is an apocalyptic number.

It is an amenable number.

1023111981 is a deficient number, since it is larger than the sum of its proper divisors (533878259).

1023111981 is a wasteful number, since it uses less digits than its factorization.

1023111981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5337 (or 5334 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 27.

The square root of 1023111981 is about 31986.1216936346. The cubic root of 1023111981 is about 1007.6453926746.

The spelling of 1023111981 in words is "one billion, twenty-three million, one hundred eleven thousand, nine hundred eighty-one".