1313231555 has 8 divisors (see below), whose sum is σ = 1668576672. Its totient is φ = 988786048.

The previous prime is 1313231539. The next prime is 1313231573. The reversal of 1313231555 is 5551323131.

It is a happy number.

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 1313231555 - 2⁴ = 1313231539 is a prime.

It is a Duffinian 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, 7724807 + ... + 7724976.

It is an arithmetic number, because the mean of its divisors is an integer number (208572084).

Almost surely, 2^1313231555 is an apocalyptic number.

1313231555 is a deficient number, since it is larger than the sum of its proper divisors (355345117).

1313231555 is a wasteful number, since it uses less digits than its factorization.

1313231555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15449805.

The product of its digits is 6750, while the sum is 29.

The square root of 1313231555 is about 36238.5368771975. The cubic root of 1313231555 is about 1095.0831668169.

Adding to 1313231555 its reverse (5551323131), we get a palindrome (6864554686).

The spelling of 1313231555 in words is "one billion, three hundred thirteen million, two hundred thirty-one thousand, five hundred fifty-five".