42811391 has 8 divisors (see below), whose sum is σ = 49102464. Its totient is φ = 36564120.

The previous prime is 42811277. The next prime is 42811393. The reversal of 42811391 is 19311824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42811391 - 2¹⁰ = 42810367 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 (42811393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8825 + ... + 12786.

It is an arithmetic number, because the mean of its divisors is an integer number (6137808).

Almost surely, 2^42811391 is an apocalyptic number.

42811391 is a deficient number, since it is larger than the sum of its proper divisors (6291073).

42811391 is a wasteful number, since it uses less digits than its factorization.

42811391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21901.

The product of its digits is 1728, while the sum is 29.

The square root of 42811391 is about 6543.0414181786. The cubic root of 42811391 is about 349.8268286189.

The spelling of 42811391 in words is "forty-two million, eight hundred eleven thousand, three hundred ninety-one".