229536129891 has 4 divisors (see below), whose sum is σ = 306048173192. Its totient is φ = 153024086592.

The previous prime is 229536129883. The next prime is 229536129899. The reversal of 229536129891 is 198921635922.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (229536129883) and next prime (229536129899).

It is not a de Polignac number, because 229536129891 - 2³ = 229536129883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (229536129899) 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, 38256021646 + ... + 38256021651.

It is an arithmetic number, because the mean of its divisors is an integer number (76512043298).

Almost surely, 2^229536129891 is an apocalyptic number.

229536129891 is a deficient number, since it is larger than the sum of its proper divisors (76512043301).

229536129891 is an equidigital number, since it uses as much as digits as its factorization.

229536129891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76512043300.

The product of its digits is 4199040, while the sum is 57.

The spelling of 229536129891 in words is "two hundred twenty-nine billion, five hundred thirty-six million, one hundred twenty-nine thousand, eight hundred ninety-one".