84820961 has 2 divisors, whose sum is σ = 84820962. Its totient is φ = 84820960.

The previous prime is 84820907. The next prime is 84820979. The reversal of 84820961 is 16902848.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44422225 + 40398736 = 6665^2 + 6356^2 .

It is a cyclic number.

It is not a de Polignac number, because 84820961 - 2²² = 80626657 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (84820661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42410480 + 42410481.

It is an arithmetic number, because the mean of its divisors is an integer number (42410481).

Almost surely, 2^84820961 is an apocalyptic number.

It is an amenable number.

84820961 is a deficient number, since it is larger than the sum of its proper divisors (1).

84820961 is an equidigital number, since it uses as much as digits as its factorization.

84820961 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 84820961 is about 9209.8295858284. The cubic root of 84820961 is about 439.3740427679.

The spelling of 84820961 in words is "eighty-four million, eight hundred twenty thousand, nine hundred sixty-one".