42471971 has 2 divisors, whose sum is σ = 42471972. Its totient is φ = 42471970.

The previous prime is 42471937. The next prime is 42471983. The reversal of 42471971 is 17917424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42471971 - 2⁶ = 42471907 is a prime.

It is equal to p_2574584 and since 42471971 and 2574584 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (42471931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21235985 + 21235986.

It is an arithmetic number, because the mean of its divisors is an integer number (21235986).

Almost surely, 2^42471971 is an apocalyptic number.

42471971 is a deficient number, since it is larger than the sum of its proper divisors (1).

42471971 is an equidigital number, since it uses as much as digits as its factorization.

42471971 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14112, while the sum is 35.

The square root of 42471971 is about 6517.0523244792. The cubic root of 42471971 is about 348.8998681001.

Subtracting from 42471971 its sum of digits (35), we obtain a triangular number (42471936 = T₉₂₁₆).

The spelling of 42471971 in words is "forty-two million, four hundred seventy-one thousand, nine hundred seventy-one".