1311455155 has 16 divisors (see below), whose sum is σ = 1626144768. Its totient is φ = 1014300000.

The previous prime is 1311455149. The next prime is 1311455177. The reversal of 1311455155 is 5515541131.

It is a happy number.

It is not a de Polignac number, because 1311455155 - 2¹¹ = 1311453107 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 174730 + ... + 182080.

It is an arithmetic number, because the mean of its divisors is an integer number (101634048).

Almost surely, 2^1311455155 is an apocalyptic number.

1311455155 is a deficient number, since it is larger than the sum of its proper divisors (314689613).

1311455155 is a wasteful number, since it uses less digits than its factorization.

1311455155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8538.

The product of its digits is 7500, while the sum is 31.

The square root of 1311455155 is about 36214.0187634568. The cubic root of 1311455155 is about 1094.5891733233.

Adding to 1311455155 its reverse (5515541131), we get a palindrome (6826996286).

The spelling of 1311455155 in words is "one billion, three hundred eleven million, four hundred fifty-five thousand, one hundred fifty-five".