42681577 has 4 divisors (see below), whose sum is σ = 45192276. Its totient is φ = 40170880.

The previous prime is 42681563. The next prime is 42681599. The reversal of 42681577 is 77518624.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 19149376 + 23532201 = 4376^2 + 4851^2 .

It is a cyclic number.

It is not a de Polignac number, because 42681577 - 2¹⁹ = 42157289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42681547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1255324 + ... + 1255357.

It is an arithmetic number, because the mean of its divisors is an integer number (11298069).

Almost surely, 2^42681577 is an apocalyptic number.

It is an amenable number.

42681577 is a deficient number, since it is larger than the sum of its proper divisors (2510699).

42681577 is a wasteful number, since it uses less digits than its factorization.

42681577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510698.

The product of its digits is 94080, while the sum is 40.

The square root of 42681577 is about 6533.1138823688. The cubic root of 42681577 is about 349.4728854537.

The spelling of 42681577 in words is "forty-two million, six hundred eighty-one thousand, five hundred seventy-seven".