42231971 has 2 divisors, whose sum is σ = 42231972. Its totient is φ = 42231970.

The previous prime is 42231967. The next prime is 42231983. The reversal of 42231971 is 17913224.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42231971 - 2² = 42231967 is a prime.

It is not a weakly prime, because it can be changed into another prime (42231571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21115985 + 21115986.

It is an arithmetic number, because the mean of its divisors is an integer number (21115986).

Almost surely, 2^42231971 is an apocalyptic number.

42231971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42231971 is an equidigital number, since it uses as much as digits as its factorization.

42231971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 42231971 is about 6498.6130058652. The cubic root of 42231971 is about 348.2414402157.

The spelling of 42231971 in words is "forty-two million, two hundred thirty-one thousand, nine hundred seventy-one".