42573991 has 2 divisors, whose sum is σ = 42573992. Its totient is φ = 42573990.

The previous prime is 42573977. The next prime is 42574009. The reversal of 42573991 is 19937524.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42573991 - 2⁵ = 42573959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42573901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21286995 + 21286996.

It is an arithmetic number, because the mean of its divisors is an integer number (21286996).

Almost surely, 2^42573991 is an apocalyptic number.

42573991 is a deficient number, since it is larger than the sum of its proper divisors (1).

42573991 is an equidigital number, since it uses as much as digits as its factorization.

42573991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 40.

The square root of 42573991 is about 6524.8747880706. The cubic root of 42573991 is about 349.1790035823.

The spelling of 42573991 in words is "forty-two million, five hundred seventy-three thousand, nine hundred ninety-one".