1228131115 has 16 divisors (see below), whose sum is σ = 1541369088. Its totient is φ = 937626976.

The previous prime is 1228131083. The next prime is 1228131131. The reversal of 1228131115 is 5111318221.

It is a cyclic number.

It is not a de Polignac number, because 1228131115 - 2⁵ = 1228131083 is a prime.

It is a super-2 number, since 2×1228131115² = 3016612071262286450, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1228131115.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38892 + ... + 62998.

It is an arithmetic number, because the mean of its divisors is an integer number (96335568).

Almost surely, 2^1228131115 is an apocalyptic number.

1228131115 is a deficient number, since it is larger than the sum of its proper divisors (313237973).

1228131115 is a wasteful number, since it uses less digits than its factorization.

1228131115 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24578.

The product of its digits is 480, while the sum is 25.

The square root of 1228131115 is about 35044.7016680125. The cubic root of 1228131115 is about 1070.8983386512.

Adding to 1228131115 its reverse (5111318221), we get a palindrome (6339449336).

The spelling of 1228131115 in words is "one billion, two hundred twenty-eight million, one hundred thirty-one thousand, one hundred fifteen".