1029631981 has 16 divisors (see below), whose sum is σ = 1190861568. Its totient is φ = 871977600.

The previous prime is 1029631973. The next prime is 1029632027. The reversal of 1029631981 is 1891369201.

It is a cyclic number.

It is not a de Polignac number, because 1029631981 - 2³ = 1029631973 is a prime.

It is a super-2 number, since 2×1029631981² = 2120284032595968722, 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 (1029631481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374271 + ... + 377011.

It is an arithmetic number, because the mean of its divisors is an integer number (74428848).

Almost surely, 2^1029631981 is an apocalyptic number.

It is an amenable number.

1029631981 is a deficient number, since it is larger than the sum of its proper divisors (161229587).

1029631981 is a wasteful number, since it uses less digits than its factorization.

1029631981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3372.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 1029631981 is about 32087.8790355486. The cubic root of 1029631981 is about 1009.7813404372.

The spelling of 1029631981 in words is "one billion, twenty-nine million, six hundred thirty-one thousand, nine hundred eighty-one".