42403531 has 2 divisors, whose sum is σ = 42403532. Its totient is φ = 42403530.

The previous prime is 42403519. The next prime is 42403549. The reversal of 42403531 is 13530424.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42403531 - 2⁵ = 42403499 is a prime.

It is a super-2 number, since 2×42403531² = 3596118882535922, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (42403561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21201765 + 21201766.

It is an arithmetic number, because the mean of its divisors is an integer number (21201766).

Almost surely, 2^42403531 is an apocalyptic number.

42403531 is a deficient number, since it is larger than the sum of its proper divisors (1).

42403531 is an equidigital number, since it uses as much as digits as its factorization.

42403531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 42403531 is about 6511.7993673024. The cubic root of 42403531 is about 348.7123597734.

Adding to 42403531 its reverse (13530424), we get a palindrome (55933955).

The spelling of 42403531 in words is "forty-two million, four hundred three thousand, five hundred thirty-one".