1311111432 has 48 divisors (see below), whose sum is σ = 3554394480. Its totient is φ = 436610400.

The previous prime is 1311111371. The next prime is 1311111433. The reversal of 1311111432 is 2341111131.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits and also a Zuckerman number because it is divisible by the product of its digits.

It is not an unprimeable number, because it can be changed into a prime (1311111433) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70207 + ... + 86897.

It is an arithmetic number, because the mean of its divisors is an integer number (74049885).

Almost surely, 2^1311111432 is an apocalyptic number.

1311111432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1311111432 is an abundant number, since it is smaller than the sum of its proper divisors (2243283048).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311111432 is a wasteful number, since it uses less digits than its factorization.

1311111432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17794 (or 17787 counting only the distinct ones).

The product of its digits is 72, while the sum is 18.

The square root of 1311111432 is about 36209.2727350329. The cubic root of 1311111432 is about 1094.4935369743.

Adding to 1311111432 its reverse (2341111131), we get a palindrome (3652222563).

The spelling of 1311111432 in words is "one billion, three hundred eleven million, one hundred eleven thousand, four hundred thirty-two".