43309161 has 72 divisors (see below), whose sum is σ = 79357824. Its totient is φ = 23094720.

The previous prime is 43309157. The next prime is 43309169. The reversal of 43309161 is 16190334.

It is not a de Polignac number, because 43309161 - 2² = 43309157 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (43309169) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1056301 + ... + 1056341.

It is an arithmetic number, because the mean of its divisors is an integer number (1102192).

Almost surely, 2^43309161 is an apocalyptic number.

43309161 is a gapful number since it is divisible by the number (41) formed by its first and last digit.

It is an amenable number.

43309161 is a deficient number, since it is larger than the sum of its proper divisors (36048663).

43309161 is an frugal number, since it uses more digits than its factorization.

43309161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 27.

The square root of 43309161 is about 6580.9696094117. The cubic root of 43309161 is about 351.1774250921.

Adding to 43309161 its reverse (16190334), we get a palindrome (59499495).

The spelling of 43309161 in words is "forty-three million, three hundred nine thousand, one hundred sixty-one".