42645531 has 8 divisors (see below), whose sum is σ = 56931840. Its totient is φ = 28394792.

The previous prime is 42645529. The next prime is 42645539. The reversal of 42645531 is 13554624.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42645531 - 2¹ = 42645529 is a prime.

It is a super-2 number, since 2×42645531² = 3637282628543922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42645539) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5955 + ... + 10988.

It is an arithmetic number, because the mean of its divisors is an integer number (7116480).

Almost surely, 2^42645531 is an apocalyptic number.

42645531 is a deficient number, since it is larger than the sum of its proper divisors (14286309).

42645531 is a wasteful number, since it uses less digits than its factorization.

42645531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17785.

The product of its digits is 14400, while the sum is 30.

The square root of 42645531 is about 6530.3545845536. The cubic root of 42645531 is about 349.3744772848.

The spelling of 42645531 in words is "forty-two million, six hundred forty-five thousand, five hundred thirty-one".