42661057 has 2 divisors, whose sum is σ = 42661058. Its totient is φ = 42661056.

The previous prime is 42661049. The next prime is 42661063. The reversal of 42661057 is 75016624.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26532801 + 16128256 = 5151^2 + 4016^2 .

It is a cyclic number.

It is not a de Polignac number, because 42661057 - 2³ = 42661049 is a prime.

It is equal to p_2585344 and since 42661057 and 2585344 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 (42661657) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21330528 + 21330529.

It is an arithmetic number, because the mean of its divisors is an integer number (21330529).

Almost surely, 2^42661057 is an apocalyptic number.

It is an amenable number.

42661057 is a deficient number, since it is larger than the sum of its proper divisors (1).

42661057 is an equidigital number, since it uses as much as digits as its factorization.

42661057 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 42661057 is about 6531.5432326518. The cubic root of 42661057 is about 349.4168711758.

The spelling of 42661057 in words is "forty-two million, six hundred sixty-one thousand, fifty-seven".