1002189981 has 16 divisors (see below), whose sum is σ = 1439726400. Its totient is φ = 616439040.

The previous prime is 1002189961. The next prime is 1002189983. The reversal of 1002189981 is 1899812001.

It is not a de Polignac number, because 1002189981 - 2¹⁴ = 1002173597 is a prime.

It is a super-2 number, since 2×1002189981² = 2008769516033560722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1002189983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100501 + ... + 110021.

It is an arithmetic number, because the mean of its divisors is an integer number (89982900).

Almost surely, 2^1002189981 is an apocalyptic number.

It is an amenable number.

1002189981 is a deficient number, since it is larger than the sum of its proper divisors (437536419).

1002189981 is a wasteful number, since it uses less digits than its factorization.

1002189981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12236.

The product of its (nonzero) digits is 10368, while the sum is 39.

The square root of 1002189981 is about 31657.3843044557. The cubic root of 1002189981 is about 1000.7294614233.

The spelling of 1002189981 in words is "one billion, two million, one hundred eighty-nine thousand, nine hundred eighty-one".