1231181010 has 24 divisors (see below), whose sum is σ = 3201070860. Its totient is φ = 328314912.

The previous prime is 1231181009. The next prime is 1231181041. The reversal of 1231181010 is 101811321.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1077743241 + 153437769 = 32829^2 + 12387^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 6839805 + ... + 6839984.

Almost surely, 2^1231181010 is an apocalyptic number.

1231181010 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1231181010 is an abundant number, since it is smaller than the sum of its proper divisors (1969889850).

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

1231181010 is a wasteful number, since it uses less digits than its factorization.

1231181010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13679802 (or 13679799 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 18.

The square root of 1231181010 is about 35088.1890384785. The cubic root of 1231181010 is about 1071.7840821773.

Adding to 1231181010 its reverse (101811321), we get a palindrome (1332992331).

The spelling of 1231181010 in words is "one billion, two hundred thirty-one million, one hundred eighty-one thousand, ten".