84277813 has 2 divisors, whose sum is σ = 84277814. Its totient is φ = 84277812.

The previous prime is 84277751. The next prime is 84277841. The reversal of 84277813 is 31877248.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71267364 + 13010449 = 8442^2 + 3607^2 .

It is a cyclic number.

It is not a de Polignac number, because 84277813 - 2⁹ = 84277301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84277873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42138906 + 42138907.

It is an arithmetic number, because the mean of its divisors is an integer number (42138907).

Almost surely, 2^84277813 is an apocalyptic number.

It is an amenable number.

84277813 is a deficient number, since it is larger than the sum of its proper divisors (1).

84277813 is an equidigital number, since it uses as much as digits as its factorization.

84277813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 75264, while the sum is 40.

The square root of 84277813 is about 9180.2948209739. The cubic root of 84277813 is about 438.4341951373.

The spelling of 84277813 in words is "eighty-four million, two hundred seventy-seven thousand, eight hundred thirteen".