42381811 has 2 divisors, whose sum is σ = 42381812. Its totient is φ = 42381810.

The previous prime is 42381809. The next prime is 42381839. The reversal of 42381811 is 11818324.

42381811 = T₅₃₁₄ + T₅₃₁₅ + T₅₃₁₆.

It is an a-pointer prime, because the next prime (42381839) can be obtained adding 42381811 to its sum of digits (28).

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42381811 - 2¹ = 42381809 is a prime.

Together with 42381809, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 42381811.

It is not a weakly prime, because it can be changed into another prime (42381851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21190905 + 21190906.

It is an arithmetic number, because the mean of its divisors is an integer number (21190906).

Almost surely, 2^42381811 is an apocalyptic number.

42381811 is the 5316-th centered triangular number.

42381811 is a deficient number, since it is larger than the sum of its proper divisors (1).

42381811 is an equidigital number, since it uses as much as digits as its factorization.

42381811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1536, while the sum is 28.

The square root of 42381811 is about 6510.1314118841. The cubic root of 42381811 is about 348.6528102827.

The spelling of 42381811 in words is "forty-two million, three hundred eighty-one thousand, eight hundred eleven".