11111531225 has 6 divisors (see below), whose sum is σ = 13778298750. Its totient is φ = 8889224960.

The previous prime is 11111531213. The next prime is 11111531231. The reversal of 11111531225 is 52213511111.

It can be written as a sum of positive squares in 3 ways, for example, as 3612490816 + 7499040409 = 60104^2 + 86597^2 .

It is not a de Polignac number, because 11111531225 - 2²⁴ = 11094754009 is a prime.

It is a super-2 number, since 2×11111531225² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 11111531225.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 222230600 + ... + 222230649.

It is an arithmetic number, because the mean of its divisors is an integer number (2296383125).

Almost surely, 2^11111531225 is an apocalyptic number.

It is an amenable number.

11111531225 is a deficient number, since it is larger than the sum of its proper divisors (2666767525).

11111531225 is an equidigital number, since it uses as much as digits as its factorization.

11111531225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 444461259 (or 444461254 counting only the distinct ones).

The product of its digits is 300, while the sum is 23.

The spelling of 11111531225 in words is "eleven billion, one hundred eleven million, five hundred thirty-one thousand, two hundred twenty-five".