42431591 has 4 divisors (see below), whose sum is σ = 43800384. Its totient is φ = 41062800.

The previous prime is 42431567. The next prime is 42431651. The reversal of 42431591 is 19513424.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-42431591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42434591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 684350 + ... + 684411.

It is an arithmetic number, because the mean of its divisors is an integer number (10950096).

Almost surely, 2^42431591 is an apocalyptic number.

42431591 is a deficient number, since it is larger than the sum of its proper divisors (1368793).

42431591 is a wasteful number, since it uses less digits than its factorization.

42431591 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1368792.

The product of its digits is 4320, while the sum is 29.

The square root of 42431591 is about 6513.9535613942. The cubic root of 42431591 is about 348.7892614766.

The spelling of 42431591 in words is "forty-two million, four hundred thirty-one thousand, five hundred ninety-one".