43121231 has 16 divisors (see below), whose sum is σ = 48263040. Its totient is φ = 38330880.

The previous prime is 43121227. The next prime is 43121233. The reversal of 43121231 is 13212134.

It is a cyclic number.

It is not a de Polignac number, because 43121231 - 2² = 43121227 is a prime.

It is a super-2 number, since 2×43121231² = 3718881125910722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43121233) 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, 22241 + ... + 24101.

It is an arithmetic number, because the mean of its divisors is an integer number (3016440).

Almost surely, 2^43121231 is an apocalyptic number.

43121231 is a deficient number, since it is larger than the sum of its proper divisors (5141809).

43121231 is a wasteful number, since it uses less digits than its factorization.

43121231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1954.

The product of its digits is 144, while the sum is 17.

The square root of 43121231 is about 6566.6757952559. The cubic root of 43121231 is about 350.6687377693.

Adding to 43121231 its reverse (13212134), we get a palindrome (56333365).

The spelling of 43121231 in words is "forty-three million, one hundred twenty-one thousand, two hundred thirty-one".