111401043525 has 30 divisors (see below), whose sum is σ = 206353245362. Its totient is φ = 59413888800.

The previous prime is 111401043521. The next prime is 111401043553. The reversal of 111401043525 is 525340104111.

It can be written as a sum of positive squares in 3 ways, for example, as 34366485924 + 77034557601 = 185382^2 + 277551^2 .

It is not a de Polignac number, because 111401043525 - 2² = 111401043521 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (111401043521) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 27504406 + ... + 27508455.

Almost surely, 2^111401043525 is an apocalyptic number.

111401043525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

111401043525 is a deficient number, since it is larger than the sum of its proper divisors (94952201837).

111401043525 is an equidigital number, since it uses as much as digits as its factorization.

111401043525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55012883 (or 55012869 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 27.

Adding to 111401043525 its reverse (525340104111), we get a palindrome (636741147636).

The spelling of 111401043525 in words is "one hundred eleven billion, four hundred one million, forty-three thousand, five hundred twenty-five".