42731311 has 4 divisors (see below), whose sum is σ = 48835792. Its totient is φ = 36626832.

The previous prime is 42731291. The next prime is 42731321. The reversal of 42731311 is 11313724.

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

It is a cyclic number.

It is not a de Polignac number, because 42731311 - 2⁹ = 42730799 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 (42731321) 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, 3052230 + ... + 3052243.

It is an arithmetic number, because the mean of its divisors is an integer number (12208948).

Almost surely, 2^42731311 is an apocalyptic number.

42731311 is a deficient number, since it is larger than the sum of its proper divisors (6104481).

42731311 is an equidigital number, since it uses as much as digits as its factorization.

42731311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6104480.

The product of its digits is 504, while the sum is 22.

The square root of 42731311 is about 6536.9190755279. The cubic root of 42731311 is about 349.6085719272.

The spelling of 42731311 in words is "forty-two million, seven hundred thirty-one thousand, three hundred eleven".