1229128197 has 32 divisors (see below), whose sum is σ = 1844202624. Its totient is φ = 721612800.

The previous prime is 1229128177. The next prime is 1229128231. The reversal of 1229128197 is 7918219221.

It is not a de Polignac number, because 1229128197 - 2¹² = 1229124101 is a prime.

It is a super-2 number, since 2×1229128197² = 3021512249320941618, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229128177) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 292173 + ... + 296349.

It is an arithmetic number, because the mean of its divisors is an integer number (57631332).

Almost surely, 2^1229128197 is an apocalyptic number.

It is an amenable number.

1229128197 is a deficient number, since it is larger than the sum of its proper divisors (615074427).

1229128197 is a wasteful number, since it uses less digits than its factorization.

1229128197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469.

The product of its digits is 36288, while the sum is 42.

The square root of 1229128197 is about 35058.9246412379. The cubic root of 1229128197 is about 1071.1880701005.

The spelling of 1229128197 in words is "one billion, two hundred twenty-nine million, one hundred twenty-eight thousand, one hundred ninety-seven".