981558036 has 36 divisors (see below), whose sum is σ = 2627112852. Its totient is φ = 307939584.

The previous prime is 981558029. The next prime is 981558037. The reversal of 981558036 is 630855189.

981558036 is a `hidden beast` number, since 98 + 1 + 558 + 0 + 3 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 262245636 + 719312400 = 16194^2 + 26820^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a junction number, because it is equal to n+sod(n) for n = 981557982 and 981558000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981558037) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 801315 + ... + 802538.

It is an arithmetic number, because the mean of its divisors is an integer number (72975357).

Almost surely, 2^981558036 is an apocalyptic number.

It is an amenable number.

981558036 is an abundant number, since it is smaller than the sum of its proper divisors (1645554816).

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

981558036 is a wasteful number, since it uses less digits than its factorization.

981558036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1603880 (or 1603875 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 45.

The square root of 981558036 is about 31329.8266193734. The cubic root of 981558036 is about 993.8144971073.

The spelling of 981558036 in words is "nine hundred eighty-one million, five hundred fifty-eight thousand, thirty-six".