42157571 has 2 divisors, whose sum is σ = 42157572. Its totient is φ = 42157570.

The previous prime is 42157559. The next prime is 42157607. The reversal of 42157571 is 17575124.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42157571 is a prime.

It is equal to p_2556617 and since 42157571 and 2556617 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 (42147571) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078785 + 21078786.

It is an arithmetic number, because the mean of its divisors is an integer number (21078786).

Almost surely, 2^42157571 is an apocalyptic number.

42157571 is a deficient number, since it is larger than the sum of its proper divisors (1).

42157571 is an equidigital number, since it uses as much as digits as its factorization.

42157571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9800, while the sum is 32.

The square root of 42157571 is about 6492.8861841249. The cubic root of 42157571 is about 348.0368212019.

The spelling of 42157571 in words is "forty-two million, one hundred fifty-seven thousand, five hundred seventy-one".