1231100253 has 6 divisors (see below), whose sum is σ = 1778255934. Its totient is φ = 820733496.

The previous prime is 1231100209. The next prime is 1231100291. The reversal of 1231100253 is 3520011321.

It can be written as a sum of positive squares in only one way, i.e., 876041604 + 355058649 = 29598^2 + 18843^2 .

It is not a de Polignac number, because 1231100253 - 2⁸ = 1231099997 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231100053) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68394450 + ... + 68394467.

It is an arithmetic number, because the mean of its divisors is an integer number (296375989).

Almost surely, 2^1231100253 is an apocalyptic number.

It is an amenable number.

1231100253 is a deficient number, since it is larger than the sum of its proper divisors (547155681).

1231100253 is a wasteful number, since it uses less digits than its factorization.

1231100253 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136788923 (or 136788920 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 18.

The square root of 1231100253 is about 35087.0382477632. The cubic root of 1231100253 is about 1071.7606477787.

Adding to 1231100253 its reverse (3520011321), we get a palindrome (4751111574).

The spelling of 1231100253 in words is "one billion, two hundred thirty-one million, one hundred thousand, two hundred fifty-three".