1012089981 has 32 divisors (see below), whose sum is σ = 1559513088. Its totient is φ = 571896000.

The previous prime is 1012089977. The next prime is 1012090049. The reversal of 1012089981 is 1899802101.

It is not a de Polignac number, because 1012089981 - 2² = 1012089977 is a prime.

It is a super-2 number, since 2×1012089981² = 2048652259281160722, which contains 22 as substring.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1012089931) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 826936 + ... + 828158.

It is an arithmetic number, because the mean of its divisors is an integer number (48734784).

Almost surely, 2^1012089981 is an apocalyptic number.

It is an amenable number.

1012089981 is a deficient number, since it is larger than the sum of its proper divisors (547423107).

1012089981 is a wasteful number, since it uses less digits than its factorization.

1012089981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641.

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

The square root of 1012089981 is about 31813.3616739885. The cubic root of 1012089981 is about 1004.0138610304.

The spelling of 1012089981 in words is "one billion, twelve million, eighty-nine thousand, nine hundred eighty-one".