1023331981 has 4 divisors (see below), whose sum is σ = 1169522272. Its totient is φ = 877141692.

The previous prime is 1023331973. The next prime is 1023331999. The reversal of 1023331981 is 1891333201.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1891333201 = 83 ⋅22787147.

It is not a de Polignac number, because 1023331981 - 2³ = 1023331973 is a prime.

It is a super-2 number, since 2×1023331981² = 2094416686674768722, 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 (1023331901) 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, 73095135 + ... + 73095148.

It is an arithmetic number, because the mean of its divisors is an integer number (292380568).

Almost surely, 2^1023331981 is an apocalyptic number.

It is an amenable number.

1023331981 is a deficient number, since it is larger than the sum of its proper divisors (146190291).

1023331981 is an equidigital number, since it uses as much as digits as its factorization.

1023331981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146190290.

The product of its (nonzero) digits is 3888, while the sum is 31.

The square root of 1023331981 is about 31989.5605002632. The cubic root of 1023331981 is about 1007.7176122371.

The spelling of 1023331981 in words is "one billion, twenty-three million, three hundred thirty-one thousand, nine hundred eighty-one".