1231101243 has 24 divisors (see below), whose sum is σ = 1919567520. Its totient is φ = 757975680.

The previous prime is 1231101241. The next prime is 1231101253. The reversal of 1231101243 is 3421011321.

It is not a de Polignac number, because 1231101243 - 2¹ = 1231101241 is a prime.

It is a super-2 number, since 2×1231101243² = 3031220541032290098, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231101241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 96538 + ... + 108543.

It is an arithmetic number, because the mean of its divisors is an integer number (79981980).

Almost surely, 2^1231101243 is an apocalyptic number.

1231101243 is a deficient number, since it is larger than the sum of its proper divisors (688466277).

1231101243 is a wasteful number, since it uses less digits than its factorization.

1231101243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 205139 (or 205136 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

The square root of 1231101243 is about 35087.0523555342. The cubic root of 1231101243 is about 1071.7609350672.

Adding to 1231101243 its reverse (3421011321), we get a palindrome (4652112564).

The spelling of 1231101243 in words is "one billion, two hundred thirty-one million, one hundred one thousand, two hundred forty-three".