84199961 has 2 divisors, whose sum is σ = 84199962. Its totient is φ = 84199960.

The previous prime is 84199949. The next prime is 84199981. The reversal of 84199961 is 16999148.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 31854736 = 7235^2 + 5644^2 .

It is a cyclic number.

It is not a de Polignac number, because 84199961 - 2¹⁴ = 84183577 is a prime.

It is not a weakly prime, because it can be changed into another prime (84199981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42099980 + 42099981.

It is an arithmetic number, because the mean of its divisors is an integer number (42099981).

Almost surely, 2^84199961 is an apocalyptic number.

It is an amenable number.

84199961 is a deficient number, since it is larger than the sum of its proper divisors (1).

84199961 is an equidigital number, since it uses as much as digits as its factorization.

84199961 is an evil number, because the sum of its binary digits is even.

The product of its digits is 139968, while the sum is 47.

The square root of 84199961 is about 9176.0536724673. The cubic root of 84199961 is about 438.2991517085.

The spelling of 84199961 in words is "eighty-four million, one hundred ninety-nine thousand, nine hundred sixty-one".