1231155013 has 8 divisors (see below), whose sum is σ = 1345262400. Its totient is φ = 1117411680.

The previous prime is 1231154999. The next prime is 1231155053. The reversal of 1231155013 is 3105511321.

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

It is not a de Polignac number, because 1231155013 - 2¹³ = 1231146821 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 (1231155053) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83913 + ... + 97486.

It is an arithmetic number, because the mean of its divisors is an integer number (168157800).

Almost surely, 2^1231155013 is an apocalyptic number.

It is an amenable number.

1231155013 is a deficient number, since it is larger than the sum of its proper divisors (114107387).

1231155013 is a wasteful number, since it uses less digits than its factorization.

1231155013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 182027.

The product of its (nonzero) digits is 450, while the sum is 22.

The square root of 1231155013 is about 35087.8185842323. The cubic root of 1231155013 is about 1071.7765383727.

Adding to 1231155013 its reverse (3105511321), we get a palindrome (4336666334).

The spelling of 1231155013 in words is "one billion, two hundred thirty-one million, one hundred fifty-five thousand, thirteen".