1231040506 has 4 divisors (see below), whose sum is σ = 1846560762. Its totient is φ = 615520252.

The previous prime is 1231040501. The next prime is 1231040509. The reversal of 1231040506 is 6050401321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 891559881 + 339480625 = 29859^2 + 18425^2 .

It is not an unprimeable number, because it can be changed into a prime (1231040501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 307760125 + ... + 307760128.

Almost surely, 2^1231040506 is an apocalyptic number.

1231040506 is a deficient number, since it is larger than the sum of its proper divisors (615520256).

1231040506 is an equidigital number, since it uses as much as digits as its factorization.

1231040506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 615520255.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 1231040506 is about 35086.1868261571. The cubic root of 1231040506 is about 1071.7433094888.

Adding to 1231040506 its reverse (6050401321), we get a palindrome (7281441827).

The spelling of 1231040506 in words is "one billion, two hundred thirty-one million, forty thousand, five hundred six".