111971225 has 12 divisors (see below), whose sum is σ = 143324160. Its totient is φ = 86686800.

The previous prime is 111971221. The next prime is 111971227. The reversal of 111971225 is 522179111.

It is a happy number.

It is not a de Polignac number, because 111971225 - 2² = 111971221 is a prime.

It is not an unprimeable number, because it can be changed into a prime (111971221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 71465 + ... + 73014.

It is an arithmetic number, because the mean of its divisors is an integer number (11943680).

Almost surely, 2^111971225 is an apocalyptic number.

It is an amenable number.

111971225 is a deficient number, since it is larger than the sum of its proper divisors (31352935).

111971225 is a wasteful number, since it uses less digits than its factorization.

111971225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144520 (or 144515 counting only the distinct ones).

The product of its digits is 1260, while the sum is 29.

The square root of 111971225 is about 10581.6456659633. The cubic root of 111971225 is about 481.9871684399.

The spelling of 111971225 in words is "one hundred eleven million, nine hundred seventy-one thousand, two hundred twenty-five".