43172971 has 2 divisors, whose sum is σ = 43172972. Its totient is φ = 43172970.

The previous prime is 43172963. The next prime is 43172999. The reversal of 43172971 is 17927134.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43172971 - 2³ = 43172963 is a prime.

It is not a weakly prime, because it can be changed into another prime (43179971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21586485 + 21586486.

It is an arithmetic number, because the mean of its divisors is an integer number (21586486).

Almost surely, 2^43172971 is an apocalyptic number.

43172971 is a deficient number, since it is larger than the sum of its proper divisors (1).

43172971 is an equidigital number, since it uses as much as digits as its factorization.

43172971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 10584, while the sum is 34.

The square root of 43172971 is about 6570.6142026450. The cubic root of 43172971 is about 350.8089343595.

The spelling of 43172971 in words is "forty-three million, one hundred seventy-two thousand, nine hundred seventy-one".