42849531 has 6 divisors (see below), whose sum is σ = 61893780. Its totient is φ = 28566348.

The previous prime is 42849509. The next prime is 42849563. The reversal of 42849531 is 13594824.

42849531 is a `hidden beast` number, since 42 + 84 + 9 + 531 = 666.

It is not a de Polignac number, because 42849531 - 2⁷ = 42849403 is a prime.

It is a super-2 number, since 2×42849531² = 3672164613839922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42849031) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2380521 + ... + 2380538.

It is an arithmetic number, because the mean of its divisors is an integer number (10315630).

Almost surely, 2^42849531 is an apocalyptic number.

42849531 is a deficient number, since it is larger than the sum of its proper divisors (19044249).

42849531 is a wasteful number, since it uses less digits than its factorization.

42849531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4761065 (or 4761062 counting only the distinct ones).

The product of its digits is 34560, while the sum is 36.

The square root of 42849531 is about 6545.9553160711. The cubic root of 42849531 is about 349.9306828714.

The spelling of 42849531 in words is "forty-two million, eight hundred forty-nine thousand, five hundred thirty-one".