981987126109 has 8 divisors (see below), whose sum is σ = 1071291557952. Its totient is φ = 892688173440.

The previous prime is 981987126041. The next prime is 981987126119. The reversal of 981987126109 is 901621789189.

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

It is a cyclic number.

It is not a de Polignac number, because 981987126109 - 2⁹ = 981987125597 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981987126119) 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, 990484 + ... + 1716109.

It is an arithmetic number, because the mean of its divisors is an integer number (133911444744).

Almost surely, 2^981987126109 is an apocalyptic number.

It is an amenable number.

981987126109 is a deficient number, since it is larger than the sum of its proper divisors (89304431843).

981987126109 is a wasteful number, since it uses less digits than its factorization.

981987126109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2739587.

The product of its (nonzero) digits is 3919104, while the sum is 61.

The spelling of 981987126109 in words is "nine hundred eighty-one billion, nine hundred eighty-seven million, one hundred twenty-six thousand, one hundred nine".