981000978999 has 8 divisors (see below), whose sum is σ = 1308146658672. Its totient is φ = 653927976000.

The previous prime is 981000978977. The next prime is 981000979033. The reversal of 981000978999 is 999879000189.

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

It is not a de Polignac number, because 981000978999 - 2²⁷ = 980866761271 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981000978899) 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, 18137664 + ... + 18191669.

It is an arithmetic number, because the mean of its divisors is an integer number (163518332334).

Almost surely, 2^981000978999 is an apocalyptic number.

981000978999 is a deficient number, since it is larger than the sum of its proper divisors (327145679673).

981000978999 is a wasteful number, since it uses less digits than its factorization.

981000978999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36338337.

The product of its (nonzero) digits is 26453952, while the sum is 69.

The spelling of 981000978999 in words is "nine hundred eighty-one billion, nine hundred seventy-eight thousand, nine hundred ninety-nine".