1311561230555 has 8 divisors (see below), whose sum is σ = 1573881490944. Its totient is φ = 1049243641600.

The previous prime is 1311561230513. The next prime is 1311561230579. The reversal of 1311561230555 is 5550321651131.

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

It is a de Polignac number, because none of the positive numbers 2^k-1311561230555 is a prime.

It is a super-2 number, since 2×1311561230555² (a number of 25 digits) contains 22 as substring.

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, 647915 + ... + 1744395.

It is an arithmetic number, because the mean of its divisors is an integer number (196735186368).

Almost surely, 2^{1311561230555} is an apocalyptic number.

1311561230555 is a deficient number, since it is larger than the sum of its proper divisors (262320260389).

1311561230555 is a wasteful number, since it uses less digits than its factorization.

1311561230555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1335717.

The product of its (nonzero) digits is 67500, while the sum is 38.

Adding to 1311561230555 its reverse (5550321651131), we get a palindrome (6861882881686).

The spelling of 1311561230555 in words is "one trillion, three hundred eleven billion, five hundred sixty-one million, two hundred thirty thousand, five hundred fifty-five".