111242161431 has 16 divisors (see below), whose sum is σ = 165723897600. Its totient is φ = 73747128024.

The previous prime is 111242161421. The next prime is 111242161441. The reversal of 111242161431 is 134161242111.

It is a happy number.

111242161431 is a `hidden beast` number, since 1 + 1 + 1 + 2 + 42 + 1 + 614 + 3 + 1 = 666.

It is an interprime number because it is at equal distance from previous prime (111242161421) and next prime (111242161441).

It is not a de Polignac number, because 111242161431 - 2⁹ = 111242160919 is a prime.

It is a super-2 number, since 2×111242161431² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 111242161395 and 111242161404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111242161421) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11503771 + ... + 11513436.

It is an arithmetic number, because the mean of its divisors is an integer number (10357743600).

Almost surely, 2^111242161431 is an apocalyptic number.

111242161431 is a deficient number, since it is larger than the sum of its proper divisors (54481736169).

111242161431 is a wasteful number, since it uses less digits than its factorization.

111242161431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23017395 (or 23017389 counting only the distinct ones).

The product of its digits is 1152, while the sum is 27.

The spelling of 111242161431 in words is "one hundred eleven billion, two hundred forty-two million, one hundred sixty-one thousand, four hundred thirty-one".