1111428215 has 4 divisors (see below), whose sum is σ = 1333713864. Its totient is φ = 889142568.

The previous prime is 1111428211. The next prime is 1111428217. The reversal of 1111428215 is 5128241111.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1111428215 - 2² = 1111428211 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1111428211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 111142817 + ... + 111142826.

It is an arithmetic number, because the mean of its divisors is an integer number (333428466).

Almost surely, 2^1111428215 is an apocalyptic number.

1111428215 is a deficient number, since it is larger than the sum of its proper divisors (222285649).

1111428215 is an equidigital number, since it uses as much as digits as its factorization.

1111428215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 222285648.

The product of its digits is 640, while the sum is 26.

The square root of 1111428215 is about 33338.0895523424. The cubic root of 1111428215 is about 1035.8426908305.

Adding to 1111428215 its reverse (5128241111), we get a palindrome (6239669326).

The spelling of 1111428215 in words is "one billion, one hundred eleven million, four hundred twenty-eight thousand, two hundred fifteen".