42297557 has 2 divisors, whose sum is σ = 42297558. Its totient is φ = 42297556.

The previous prime is 42297533. The next prime is 42297589. The reversal of 42297557 is 75579224.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 22146436 + 20151121 = 4706^2 + 4489^2 .

It is a cyclic number.

It is not a de Polignac number, because 42297557 - 2²² = 38103253 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42296557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21148778 + 21148779.

It is an arithmetic number, because the mean of its divisors is an integer number (21148779).

Almost surely, 2^42297557 is an apocalyptic number.

It is an amenable number.

42297557 is a deficient number, since it is larger than the sum of its proper divisors (1).

42297557 is an equidigital number, since it uses as much as digits as its factorization.

42297557 is an evil number, because the sum of its binary digits is even.

The product of its digits is 176400, while the sum is 41.

The square root of 42297557 is about 6503.6572019134. The cubic root of 42297557 is about 348.4216192713.

It can be divided in two parts, 422 and 97557, that added together give a palindrome (97979).

The spelling of 42297557 in words is "forty-two million, two hundred ninety-seven thousand, five hundred fifty-seven".