1029981 has 4 divisors (see below), whose sum is σ = 1373312. Its totient is φ = 686652.

The previous prime is 1029967. The next prime is 1029983. The reversal of 1029981 is 1899201.

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: 1899201 = 3 ⋅633067.

It is not a de Polignac number, because 1029981 - 2¹⁰ = 1028957 is a prime.

It is a super-2 number, since 2×1029981² = 2121721720722, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1029983) 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, 171661 + ... + 171666.

It is an arithmetic number, because the mean of its divisors is an integer number (343328).

2^1029981 is an apocalyptic number.

It is an amenable number.

1029981 is a deficient number, since it is larger than the sum of its proper divisors (343331).

1029981 is an equidigital number, since it uses as much as digits as its factorization.

1029981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 343330.

The product of its (nonzero) digits is 1296, while the sum is 30.

The square root of 1029981 is about 1014.8797958379. The cubic root of 1029981 is about 100.9895424261.

The spelling of 1029981 in words is "one million, twenty-nine thousand, nine hundred eighty-one".