111216513125 has 10 divisors (see below), whose sum is σ = 138976155582. Its totient is φ = 88973210000.

The previous prime is 111216513047. The next prime is 111216513193. The reversal of 111216513125 is 521315612111.

It is a happy number.

It can be written as a sum of positive squares in 5 ways, for example, as 13111624036 + 98104889089 = 114506^2 + 313217^2 .

It is not a de Polignac number, because 111216513125 - 2³⁰ = 110142771301 is a prime.

It is a super-2 number, since 2×111216513125² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 88972586 + ... + 88973835.

Almost surely, 2^111216513125 is an apocalyptic number.

It is an amenable number.

111216513125 is a deficient number, since it is larger than the sum of its proper divisors (27759642457).

111216513125 is an frugal number, since it uses more digits than its factorization.

111216513125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 177946441 (or 177946426 counting only the distinct ones).

The product of its digits is 1800, while the sum is 29.

The spelling of 111216513125 in words is "one hundred eleven billion, two hundred sixteen million, five hundred thirteen thousand, one hundred twenty-five".