1231172013 has 16 divisors (see below), whose sum is σ = 1735524800. Its totient is φ = 774178560.

The previous prime is 1231171999. The next prime is 1231172017. The reversal of 1231172013 is 3102711321.

It is a happy number.

It is not a de Polignac number, because 1231172013 - 2¹⁶ = 1231106477 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1231172017) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 34108 + ... + 60213.

It is an arithmetic number, because the mean of its divisors is an integer number (108470300).

Almost surely, 2^1231172013 is an apocalyptic number.

It is an amenable number.

1231172013 is a deficient number, since it is larger than the sum of its proper divisors (504352787).

1231172013 is a wasteful number, since it uses less digits than its factorization.

1231172013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 94572.

The product of its (nonzero) digits is 252, while the sum is 21.

The square root of 1231172013 is about 35088.0608327106. The cubic root of 1231172013 is about 1071.7814714415.

Adding to 1231172013 its reverse (3102711321), we get a palindrome (4333883334).

The spelling of 1231172013 in words is "one billion, two hundred thirty-one million, one hundred seventy-two thousand, thirteen".