1019981 has 8 divisors (see below), whose sum is σ = 1083264. Its totient is φ = 958320.

The previous prime is 1019971. The next prime is 1020001. The reversal of 1019981 is 1899101.

1019981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1019981 - 2¹⁰ = 1018957 is a prime.

It is a super-2 number, since 2×1019981² = 2080722480722, 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 (1019971) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1040 + ... + 1766.

It is an arithmetic number, because the mean of its divisors is an integer number (135408).

2^1019981 is an apocalyptic number.

It is an amenable number.

1019981 is a deficient number, since it is larger than the sum of its proper divisors (63283).

1019981 is an equidigital number, since it uses as much as digits as its factorization.

1019981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811.

The product of its (nonzero) digits is 648, while the sum is 29.

The square root of 1019981 is about 1009.9410873907. The cubic root of 1019981 is about 100.6616459250.

It can be divided in two parts, 10 and 19981, that added together give a palindrome (19991).

The spelling of 1019981 in words is "one million, nineteen thousand, nine hundred eighty-one".