981532331 has 4 divisors (see below), whose sum is σ = 1057034832. Its totient is φ = 906029832.

The previous prime is 981532301. The next prime is 981532339. The reversal of 981532331 is 133235189.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-981532331 is a prime.

It is a super-2 number, since 2×981532331² = 1926811433596587122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 981532291 and 981532300.

It is not an unprimeable number, because it can be changed into a prime (981532339) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37751231 + ... + 37751256.

It is an arithmetic number, because the mean of its divisors is an integer number (264258708).

Almost surely, 2^981532331 is an apocalyptic number.

981532331 is a deficient number, since it is larger than the sum of its proper divisors (75502501).

981532331 is a wasteful number, since it uses less digits than its factorization.

981532331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75502500.

The product of its digits is 19440, while the sum is 35.

The square root of 981532331 is about 31329.4163846057. The cubic root of 981532331 is about 993.8058217077.

The spelling of 981532331 in words is "nine hundred eighty-one million, five hundred thirty-two thousand, three hundred thirty-one".