1231130405 has 8 divisors (see below), whose sum is σ = 1478268792. Its totient is φ = 984296128.

The previous prime is 1231130393. The next prime is 1231130447. The reversal of 1231130405 is 5040311321.

It can be written as a sum of positive squares in 4 ways, for example, as 67092481 + 1164037924 = 8191^2 + 34118^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1231130405 - 2⁴ = 1231130389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67022 + ... + 83391.

It is an arithmetic number, because the mean of its divisors is an integer number (184783599).

Almost surely, 2^1231130405 is an apocalyptic number.

It is an amenable number.

1231130405 is a deficient number, since it is larger than the sum of its proper divisors (247138387).

1231130405 is a wasteful number, since it uses less digits than its factorization.

1231130405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 152055.

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 1231130405 is about 35087.4679194723. The cubic root of 1231130405 is about 1071.7693975300.

Adding to 1231130405 its reverse (5040311321), we get a palindrome (6271441726).

The spelling of 1231130405 in words is "one billion, two hundred thirty-one million, one hundred thirty thousand, four hundred five".