1228361911 has 8 divisors (see below), whose sum is σ = 1486421280. Its totient is φ = 990947328.

The previous prime is 1228361909. The next prime is 1228361917. The reversal of 1228361911 is 1191638221.

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

It is not a de Polignac number, because 1228361911 - 2¹ = 1228361909 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 (1228361917) 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, 5161066 + ... + 5161303.

It is an arithmetic number, because the mean of its divisors is an integer number (185802660).

Almost surely, 2^1228361911 is an apocalyptic number.

1228361911 is a deficient number, since it is larger than the sum of its proper divisors (258059369).

1228361911 is a wasteful number, since it uses less digits than its factorization.

1228361911 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10322393.

The product of its digits is 5184, while the sum is 34.

The square root of 1228361911 is about 35047.9943934029. The cubic root of 1228361911 is about 1070.9654171494.

The spelling of 1228361911 in words is "one billion, two hundred twenty-eight million, three hundred sixty-one thousand, nine hundred eleven".