1231100144 has 20 divisors (see below), whose sum is σ = 2385800424. Its totient is φ = 615409728.

The previous prime is 1231100137. The next prime is 1231100147. The reversal of 1231100144 is 4410011321.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231100147) 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, 134894 + ... + 143730.

Almost surely, 2^1231100144 is an apocalyptic number.

It is an amenable number.

1231100144 is a deficient number, since it is larger than the sum of its proper divisors (1154700280).

1231100144 is an equidigital number, since it uses as much as digits as its factorization.

1231100144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17552 (or 17546 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1231100144 is about 35087.0366944830. The cubic root of 1231100144 is about 1071.7606161479.

Adding to 1231100144 its reverse (4410011321), we get a palindrome (5641111465).

The spelling of 1231100144 in words is "one billion, two hundred thirty-one million, one hundred thousand, one hundred forty-four".