84670392991 has 2 divisors, whose sum is σ = 84670392992. Its totient is φ = 84670392990.

The previous prime is 84670392977. The next prime is 84670393007. The reversal of 84670392991 is 19929307648.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 84670392991 - 2²⁹ = 84133522079 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84670392091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42335196495 + 42335196496.

It is an arithmetic number, because the mean of its divisors is an integer number (42335196496).

Almost surely, 2^84670392991 is an apocalyptic number.

84670392991 is a deficient number, since it is larger than the sum of its proper divisors (1).

84670392991 is an equidigital number, since it uses as much as digits as its factorization.

84670392991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The spelling of 84670392991 in words is "eighty-four billion, six hundred seventy million, three hundred ninety-two thousand, nine hundred ninety-one".