981481531 has 8 divisors (see below), whose sum is σ = 986183424. Its totient is φ = 976790760.

The previous prime is 981481477. The next prime is 981481559. The reversal of 981481531 is 135184189.

It is a happy number.

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 981481531 - 2²¹ = 979384379 is a prime.

It is a super-2 number, since 2×981481531² = 1926611991388207922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (981481561) 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, 211866 + ... + 216448.

It is an arithmetic number, because the mean of its divisors is an integer number (123272928).

Almost surely, 2^981481531 is an apocalyptic number.

981481531 is a deficient number, since it is larger than the sum of its proper divisors (4701893).

981481531 is a wasteful number, since it uses less digits than its factorization.

981481531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5561.

The product of its digits is 34560, while the sum is 40.

The square root of 981481531 is about 31328.6056344677. The cubic root of 981481531 is about 993.7886763371.

The spelling of 981481531 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, five hundred thirty-one".