1229728591 has 16 divisors (see below), whose sum is σ = 1534837248. Its totient is φ = 959263200.

The previous prime is 1229728589. The next prime is 1229728597. The reversal of 1229728591 is 1958279221.

It is not a de Polignac number, because 1229728591 - 2¹ = 1229728589 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1229728597) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 88705 + ... + 101626.

It is an arithmetic number, because the mean of its divisors is an integer number (95927328).

Almost surely, 2^1229728591 is an apocalyptic number.

1229728591 is a deficient number, since it is larger than the sum of its proper divisors (305108657).

1229728591 is a wasteful number, since it uses less digits than its factorization.

1229728591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 190422.

The product of its digits is 181440, while the sum is 46.

The square root of 1229728591 is about 35067.4862372540. The cubic root of 1229728591 is about 1071.3624566297.

The spelling of 1229728591 in words is "one billion, two hundred twenty-nine million, seven hundred twenty-eight thousand, five hundred ninety-one".