111431513 has 4 divisors (see below), whose sum is σ = 111510708. Its totient is φ = 111352320.

The previous prime is 111431497. The next prime is 111431557. The reversal of 111431513 is 315134111.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 315134111 = 491 ⋅641821.

It can be written as a sum of positive squares in 2 ways, for example, as 63170704 + 48260809 = 7948^2 + 6947^2 .

It is a cyclic number.

It is not a de Polignac number, because 111431513 - 2⁴ = 111431497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (111431213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37448 + ... + 40313.

It is an arithmetic number, because the mean of its divisors is an integer number (27877677).

Almost surely, 2^111431513 is an apocalyptic number.

It is an amenable number.

111431513 is a deficient number, since it is larger than the sum of its proper divisors (79195).

111431513 is an equidigital number, since it uses as much as digits as its factorization.

111431513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79194.

The product of its digits is 180, while the sum is 20.

The square root of 111431513 is about 10556.1125893958. The cubic root of 111431513 is about 481.2115127933.

Adding to 111431513 its reverse (315134111), we get a palindrome (426565624).

The spelling of 111431513 in words is "one hundred eleven million, four hundred thirty-one thousand, five hundred thirteen".