1008918981 has 48 divisors (see below), whose sum is σ = 1764272640. Its totient is φ = 542725920.

The previous prime is 1008918959. The next prime is 1008918991. The reversal of 1008918981 is 1898198001.

It is not a de Polignac number, because 1008918981 - 2⁶ = 1008918917 is a prime.

It is a super-2 number, since 2×1008918981² = 2035835020444156722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1008918991) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 192526 + ... + 197696.

It is an arithmetic number, because the mean of its divisors is an integer number (36755680).

Almost surely, 2^1008918981 is an apocalyptic number.

It is an amenable number.

1008918981 is a deficient number, since it is larger than the sum of its proper divisors (755353659).

1008918981 is a wasteful number, since it uses less digits than its factorization.

1008918981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5366 (or 5363 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 45.

The square root of 1008918981 is about 31763.4850260484. The cubic root of 1008918981 is about 1002.9641985122.

The spelling of 1008918981 in words is "one billion, eight million, nine hundred eighteen thousand, nine hundred eighty-one".