42705431 has 2 divisors, whose sum is σ = 42705432. Its totient is φ = 42705430.

The previous prime is 42705419. The next prime is 42705461. The reversal of 42705431 is 13450724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42705431 - 2¹⁴ = 42689047 is a prime.

It is a super-2 number, since 2×42705431² = 3647507673791522, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42705431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42705461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21352715 + 21352716.

It is an arithmetic number, because the mean of its divisors is an integer number (21352716).

Almost surely, 2^42705431 is an apocalyptic number.

42705431 is a deficient number, since it is larger than the sum of its proper divisors (1).

42705431 is an equidigital number, since it uses as much as digits as its factorization.

42705431 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 42705431 is about 6534.9392499089. The cubic root of 42705431 is about 349.5379781257.

The spelling of 42705431 in words is "forty-two million, seven hundred five thousand, four hundred thirty-one".