981649994 has 24 divisors (see below), whose sum is σ = 1616346732. Its totient is φ = 444487680.

The previous prime is 981649987. The next prime is 981650009. The reversal of 981649994 is 499946189.

It can be written as a sum of positive squares in 6 ways, for example, as 328080769 + 653569225 = 18113^2 + 25565^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 66314 + ... + 79754.

Almost surely, 2^981649994 is an apocalyptic number.

981649994 is a deficient number, since it is larger than the sum of its proper divisors (634696738).

981649994 is a wasteful number, since it uses less digits than its factorization.

981649994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13562 (or 13509 counting only the distinct ones).

The product of its digits is 5038848, while the sum is 59.

The square root of 981649994 is about 31331.2941641420. The cubic root of 981649994 is about 993.8455315568.

The spelling of 981649994 in words is "nine hundred eighty-one million, six hundred forty-nine thousand, nine hundred ninety-four".