42312811 has 2 divisors, whose sum is σ = 42312812. Its totient is φ = 42312810.

The previous prime is 42312763. The next prime is 42312821. The reversal of 42312811 is 11821324.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 42312811 - 2⁹ = 42312299 is a prime.

It is not a weakly prime, because it can be changed into another prime (42312821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21156405 + 21156406.

It is an arithmetic number, because the mean of its divisors is an integer number (21156406).

Almost surely, 2^42312811 is an apocalyptic number.

42312811 is a deficient number, since it is larger than the sum of its proper divisors (1).

42312811 is an equidigital number, since it uses as much as digits as its factorization.

42312811 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 22.

The square root of 42312811 is about 6504.8298209869. The cubic root of 42312811 is about 348.4634986372.

The spelling of 42312811 in words is "forty-two million, three hundred twelve thousand, eight hundred eleven".