1225011111 has 8 divisors (see below), whose sum is σ = 1719313920. Its totient is φ = 773691192.

The previous prime is 1225011107. The next prime is 1225011113. The reversal of 1225011111 is 1111105221.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1225011111 - 2² = 1225011107 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1225011113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10745655 + ... + 10745768.

It is an arithmetic number, because the mean of its divisors is an integer number (214914240).

Almost surely, 2^1225011111 is an apocalyptic number.

1225011111 is a deficient number, since it is larger than the sum of its proper divisors (494302809).

1225011111 is a wasteful number, since it uses less digits than its factorization.

1225011111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21491445.

The product of its (nonzero) digits is 20, while the sum is 15.

The square root of 1225011111 is about 35000.1587282115. The cubic root of 1225011111 is about 1069.9907155569.

Adding to 1225011111 its reverse (1111105221), we get a palindrome (2336116332).

The spelling of 1225011111 in words is "one billion, two hundred twenty-five million, eleven thousand, one hundred eleven".