42157537 has 2 divisors, whose sum is σ = 42157538. Its totient is φ = 42157536.

The previous prime is 42157519. The next prime is 42157559. The reversal of 42157537 is 73575124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 29419776 + 12737761 = 5424^2 + 3569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42157537 is a prime.

It is not a weakly prime, because it can be changed into another prime (42157337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21078768 + 21078769.

It is an arithmetic number, because the mean of its divisors is an integer number (21078769).

Almost surely, 2^42157537 is an apocalyptic number.

It is an amenable number.

42157537 is a deficient number, since it is larger than the sum of its proper divisors (1).

42157537 is an equidigital number, since it uses as much as digits as its factorization.

42157537 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 29400, while the sum is 34.

The square root of 42157537 is about 6492.8835658743. The cubic root of 42157537 is about 348.0367276382.

The spelling of 42157537 in words is "forty-two million, one hundred fifty-seven thousand, five hundred thirty-seven".