42561266 has 12 divisors (see below), whose sum is σ = 70173726. Its totient is φ = 19345920.

The previous prime is 42561223. The next prime is 42561289. The reversal of 42561266 is 66216524.

It can be written as a sum of positive squares in only one way, i.e., 30858025 + 11703241 = 5555^2 + 3421^2 .

It is a super-2 number, since 2×42561266² = 3622922727045512, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 87695 + ... + 88178.

Almost surely, 2^42561266 is an apocalyptic number.

42561266 is a deficient number, since it is larger than the sum of its proper divisors (27612460).

42561266 is a wasteful number, since it uses less digits than its factorization.

42561266 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175897 (or 175886 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 42561266 is about 6523.8996006990. The cubic root of 42561266 is about 349.1442112480.

The spelling of 42561266 in words is "forty-two million, five hundred sixty-one thousand, two hundred sixty-six".