42939511 has 2 divisors, whose sum is σ = 42939512. Its totient is φ = 42939510.

The previous prime is 42939509. The next prime is 42939521. The reversal of 42939511 is 11593924.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42939511 - 2¹ = 42939509 is a prime.

Together with 42939509, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (42939521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21469755 + 21469756.

It is an arithmetic number, because the mean of its divisors is an integer number (21469756).

Almost surely, 2^42939511 is an apocalyptic number.

42939511 is a deficient number, since it is larger than the sum of its proper divisors (1).

42939511 is an equidigital number, since it uses as much as digits as its factorization.

42939511 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9720, while the sum is 34.

The square root of 42939511 is about 6552.8246581150. The cubic root of 42939511 is about 350.1754521686.

The spelling of 42939511 in words is "forty-two million, nine hundred thirty-nine thousand, five hundred eleven".