981555239 has 8 divisors (see below), whose sum is σ = 1126809600. Its totient is φ = 837558936.

The previous prime is 981555233. The next prime is 981555241. The reversal of 981555239 is 932555189.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981555239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 981555193 and 981555202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981555233) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 312839 + ... + 315960.

It is an arithmetic number, because the mean of its divisors is an integer number (140851200).

Almost surely, 2^981555239 is an apocalyptic number.

981555239 is a deficient number, since it is larger than the sum of its proper divisors (145254361).

981555239 is a wasteful number, since it uses less digits than its factorization.

981555239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629029.

The product of its digits is 486000, while the sum is 47.

The square root of 981555239 is about 31329.7819813672. The cubic root of 981555239 is about 993.8135531313.

Subtracting from 981555239 its reverse (932555189), we obtain a triangular number (49000050 = T₉₈₉₉).

The spelling of 981555239 in words is "nine hundred eighty-one million, five hundred fifty-five thousand, two hundred thirty-nine".