1231143101 has 4 divisors (see below), whose sum is σ = 1231637472. Its totient is φ = 1230648732.

The previous prime is 1231143097. The next prime is 1231143113. The reversal of 1231143101 is 1013411321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1231143101 - 2² = 1231143097 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1231143101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231143181) 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, 243431 + ... + 248436.

It is an arithmetic number, because the mean of its divisors is an integer number (307909368).

Almost surely, 2^1231143101 is an apocalyptic number.

It is an amenable number.

1231143101 is a deficient number, since it is larger than the sum of its proper divisors (494371).

1231143101 is an equidigital number, since it uses as much as digits as its factorization.

1231143101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 494370.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 1231143101 is about 35087.6488383021. The cubic root of 1231143101 is about 1071.7730817153.

Adding to 1231143101 its reverse (1013411321), we get a palindrome (2244554422).

The spelling of 1231143101 in words is "one billion, two hundred thirty-one million, one hundred forty-three thousand, one hundred one".