43161961 has 4 divisors (see below), whose sum is σ = 45038592. Its totient is φ = 41285332.

The previous prime is 43161959. The next prime is 43161967. The reversal of 43161961 is 16916134.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16916134 = 2 ⋅8458067.

It is a cyclic number.

It is not a de Polignac number, because 43161961 - 2¹ = 43161959 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43161967) 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, 938281 + ... + 938326.

It is an arithmetic number, because the mean of its divisors is an integer number (11259648).

Almost surely, 2^43161961 is an apocalyptic number.

It is an amenable number.

43161961 is a deficient number, since it is larger than the sum of its proper divisors (1876631).

43161961 is a wasteful number, since it uses less digits than its factorization.

43161961 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1876630.

The product of its digits is 3888, while the sum is 31.

The square root of 43161961 is about 6569.7763280039. The cubic root of 43161961 is about 350.7791106476.

The spelling of 43161961 in words is "forty-three million, one hundred sixty-one thousand, nine hundred sixty-one".