981291225042 has 42 divisors (see below), whose sum is σ = 2206980767847. Its totient is φ = 327084466716.

The previous prime is 981291224981. The next prime is 981291225067. The reversal of 981291225042 is 240522192189.

981291225042 is a `hidden beast` number, since 9 + 8 + 12 + 9 + 122 + 504 + 2 = 666.

It can be written as a sum of positive squares in only one way, i.e., 490645612521 + 490645612521 = 700461^2 + 700461^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=700461.

It is an unprimeable number.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 37811923 + ... + 37837865.

Almost surely, 2^981291225042 is an apocalyptic number.

981291225042 is an abundant number, since it is smaller than the sum of its proper divisors (1225689542805).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

981291225042 is an frugal number, since it uses more digits than its factorization.

981291225042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51906 (or 25948 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 981291225042 in words is "nine hundred eighty-one billion, two hundred ninety-one million, two hundred twenty-five thousand, forty-two".