981481831 has 4 divisors (see below), whose sum is σ = 1070707464. Its totient is φ = 892256200.

The previous prime is 981481819. The next prime is 981481877. The reversal of 981481831 is 138184189.

It is a happy number.

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

It is not a de Polignac number, because 981481831 - 2¹¹ = 981479783 is a prime.

It is a super-2 number, since 2×981481831² = 1926613169166225122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (981481801) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44612800 + ... + 44612821.

It is an arithmetic number, because the mean of its divisors is an integer number (267676866).

Almost surely, 2^981481831 is an apocalyptic number.

981481831 is a deficient number, since it is larger than the sum of its proper divisors (89225633).

981481831 is a wasteful number, since it uses less digits than its factorization.

981481831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89225632.

The product of its digits is 55296, while the sum is 43.

The square root of 981481831 is about 31328.6104224238. The cubic root of 981481831 is about 993.7887775910.

The spelling of 981481831 in words is "nine hundred eighty-one million, four hundred eighty-one thousand, eight hundred thirty-one".