42075531 has 20 divisors (see below), whose sum is σ = 63799912. Its totient is φ = 27628128.

The previous prime is 42075511. The next prime is 42075559. The reversal of 42075531 is 13557024.

It is a happy number.

It is not a de Polignac number, because 42075531 - 2⁵ = 42075499 is a prime.

It is a super-2 number, since 2×42075531² = 3540700617863922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 42075495 and 42075504.

It is not an unprimeable number, because it can be changed into a prime (42075511) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1551 + ... + 9303.

Almost surely, 2^42075531 is an apocalyptic number.

42075531 is a deficient number, since it is larger than the sum of its proper divisors (21724381).

42075531 is an equidigital number, since it uses as much as digits as its factorization.

42075531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7832 (or 7823 counting only the distinct ones).

The product of its (nonzero) digits is 4200, while the sum is 27.

The square root of 42075531 is about 6486.5654240129. The cubic root of 42075531 is about 347.8109109495.

The spelling of 42075531 in words is "forty-two million, seventy-five thousand, five hundred thirty-one".