1231105131 has 24 divisors (see below), whose sum is σ = 1802567520. Its totient is φ = 809582976.

The previous prime is 1231105103. The next prime is 1231105177. The reversal of 1231105131 is 1315011321.

It is not a de Polignac number, because 1231105131 - 2⁶ = 1231105067 is a prime.

It is a super-2 number, since 2×1231105131² = 3031239687149054322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1231105231) 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, 246895 + ... + 251831.

It is an arithmetic number, because the mean of its divisors is an integer number (75106980).

Almost surely, 2^1231105131 is an apocalyptic number.

1231105131 is a deficient number, since it is larger than the sum of its proper divisors (571462389).

1231105131 is a wasteful number, since it uses less digits than its factorization.

1231105131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5315 (or 5312 counting only the distinct ones).

The product of its (nonzero) digits is 90, while the sum is 18.

The square root of 1231105131 is about 35087.1077605436. The cubic root of 1231105131 is about 1071.7620633259.

Adding to 1231105131 its reverse (1315011321), we get a palindrome (2546116452).

The spelling of 1231105131 in words is "one billion, two hundred thirty-one million, one hundred five thousand, one hundred thirty-one".