43161331 has 16 divisors (see below), whose sum is σ = 47349760. Its totient is φ = 39191040.

The previous prime is 43161329. The next prime is 43161337. The reversal of 43161331 is 13316134.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 43161331 - 2¹ = 43161329 is a prime.

It is a super-2 number, since 2×43161331² = 3725800987383122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43161337) 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, 74515 + ... + 75091.

It is an arithmetic number, because the mean of its divisors is an integer number (2959360).

Almost surely, 2^43161331 is an apocalyptic number.

43161331 is a deficient number, since it is larger than the sum of its proper divisors (4188429).

43161331 is a wasteful number, since it uses less digits than its factorization.

43161331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754.

The product of its digits is 648, while the sum is 22.

The square root of 43161331 is about 6569.7283809911. The cubic root of 43161331 is about 350.7774039603. Note that the first 3 decimals are identical.

Adding to 43161331 its reverse (13316134), we get a palindrome (56477465).

It can be divided in two parts, 4316133 and 1, that added together give a palindrome (4316134).

The spelling of 43161331 in words is "forty-three million, one hundred sixty-one thousand, three hundred thirty-one".