1228015191 has 16 divisors (see below), whose sum is σ = 1764274176. Its totient is φ = 755285856.

The previous prime is 1228015177. The next prime is 1228015207. The reversal of 1228015191 is 1915108221.

It is a de Polignac number, because none of the positive numbers 2^k-1228015191 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1228015171) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72826 + ... + 88088.

It is an arithmetic number, because the mean of its divisors is an integer number (110267136).

Almost surely, 2^1228015191 is an apocalyptic number.

1228015191 is a deficient number, since it is larger than the sum of its proper divisors (536258985).

1228015191 is a wasteful number, since it uses less digits than its factorization.

1228015191 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17342.

The product of its (nonzero) digits is 1440, while the sum is 30.

The square root of 1228015191 is about 35043.0476842412. The cubic root of 1228015191 is about 1070.8646433550.

The spelling of 1228015191 in words is "one billion, two hundred twenty-eight million, fifteen thousand, one hundred ninety-one".