842523811 has 4 divisors (see below), whose sum is σ = 862117432. Its totient is φ = 822930192.

The previous prime is 842523793. The next prime is 842523839. The reversal of 842523811 is 118325248.

It is a happy number.

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 842523811 - 2⁵ = 842523779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (842523911) 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, 9796746 + ... + 9796831.

It is an arithmetic number, because the mean of its divisors is an integer number (215529358).

Almost surely, 2^842523811 is an apocalyptic number.

842523811 is a deficient number, since it is larger than the sum of its proper divisors (19593621).

842523811 is a wasteful number, since it uses less digits than its factorization.

842523811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19593620.

The product of its digits is 15360, while the sum is 34.

The square root of 842523811 is about 29026.2607133609. The cubic root of 842523811 is about 944.4828169564.

The spelling of 842523811 in words is "eight hundred forty-two million, five hundred twenty-three thousand, eight hundred eleven".