1981033263 has 48 divisors (see below), whose sum is σ = 3333268224. Its totient is φ = 1121662080.

The previous prime is 1981033261. The next prime is 1981033303. The reversal of 1981033263 is 3623301891.

1981033263 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1981033263 - 2¹ = 1981033261 is a prime.

It is a super-2 number, since 2×1981033263² = 7848985578224854338, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1981033261) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 87795 + ... + 108027.

It is an arithmetic number, because the mean of its divisors is an integer number (69443088).

Almost surely, 2^1981033263 is an apocalyptic number.

1981033263 is a deficient number, since it is larger than the sum of its proper divisors (1352234961).

1981033263 is a wasteful number, since it uses less digits than its factorization.

1981033263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20316 (or 20313 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 1981033263 is about 44508.7998377849. The cubic root of 1981033263 is about 1255.9256279326.

The spelling of 1981033263 in words is "one billion, nine hundred eighty-one million, thirty-three thousand, two hundred sixty-three".