840091963 has 2 divisors, whose sum is σ = 840091964. Its totient is φ = 840091962.

The previous prime is 840091961. The next prime is 840092023. The reversal of 840091963 is 369190048.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 840091963 - 2¹ = 840091961 is a prime.

Together with 840091961, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (840091961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 420045981 + 420045982.

It is an arithmetic number, because the mean of its divisors is an integer number (420045982).

Almost surely, 2^840091963 is an apocalyptic number.

840091963 is a deficient number, since it is larger than the sum of its proper divisors (1).

840091963 is an equidigital number, since it uses as much as digits as its factorization.

840091963 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 840091963 is about 28984.3399614343. The cubic root of 840091963 is about 943.5732276077.

The spelling of 840091963 in words is "eight hundred forty million, ninety-one thousand, nine hundred sixty-three".