1228170511 has 4 divisors (see below), whose sum is σ = 1228244872. Its totient is φ = 1228096152.

The previous prime is 1228170481. The next prime is 1228170527. The reversal of 1228170511 is 1150718221.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1150718221 = 23 ⋅50031227.

It is a cyclic number.

It is not a de Polignac number, because 1228170511 - 2⁵ = 1228170479 is a prime.

It is a super-2 number, since 2×1228170511² = 3016805608180002242, 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 1228170511.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228170311) 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, 36 + ... + 49561.

It is an arithmetic number, because the mean of its divisors is an integer number (307061218).

Almost surely, 2^1228170511 is an apocalyptic number.

1228170511 is a deficient number, since it is larger than the sum of its proper divisors (74361).

1228170511 is an equidigital number, since it uses as much as digits as its factorization.

1228170511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74360.

The product of its (nonzero) digits is 1120, while the sum is 28.

The square root of 1228170511 is about 35045.2637456190. The cubic root of 1228170511 is about 1070.9097892907.

Adding to 1228170511 its reverse (1150718221), we get a palindrome (2378888732).

The spelling of 1228170511 in words is "one billion, two hundred twenty-eight million, one hundred seventy thousand, five hundred eleven".