42406591 has 2 divisors, whose sum is σ = 42406592. Its totient is φ = 42406590.

The previous prime is 42406579. The next prime is 42406597. The reversal of 42406591 is 19560424.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42406591 - 2¹¹ = 42404543 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42406597) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21203295 + 21203296.

It is an arithmetic number, because the mean of its divisors is an integer number (21203296).

Almost surely, 2^42406591 is an apocalyptic number.

42406591 is a deficient number, since it is larger than the sum of its proper divisors (1).

42406591 is an equidigital number, since it uses as much as digits as its factorization.

42406591 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 42406591 is about 6512.0343211626. The cubic root of 42406591 is about 348.7207477081.

The spelling of 42406591 in words is "forty-two million, four hundred six thousand, five hundred ninety-one".