42591655 has 4 divisors (see below), whose sum is σ = 51109992. Its totient is φ = 34073320.

The previous prime is 42591649. The next prime is 42591667. The reversal of 42591655 is 55619524.

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

It is a de Polignac number, because none of the positive numbers 2^k-42591655 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4259161 + ... + 4259170.

It is an arithmetic number, because the mean of its divisors is an integer number (12777498).

Almost surely, 2^42591655 is an apocalyptic number.

42591655 is a deficient number, since it is larger than the sum of its proper divisors (8518337).

42591655 is an equidigital number, since it uses as much as digits as its factorization.

42591655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8518336.

The product of its digits is 54000, while the sum is 37.

The square root of 42591655 is about 6526.2282368915. The cubic root of 42591655 is about 349.2272885011.

The spelling of 42591655 in words is "forty-two million, five hundred ninety-one thousand, six hundred fifty-five".