84400061 has 2 divisors, whose sum is σ = 84400062. Its totient is φ = 84400060.

The previous prime is 84400051. The next prime is 84400067. The reversal of 84400061 is 16000448.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54479161 + 29920900 = 7381^2 + 5470^2 .

It is a cyclic number.

It is not a de Polignac number, because 84400061 - 2¹⁸ = 84137917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84400067) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42200030 + 42200031.

It is an arithmetic number, because the mean of its divisors is an integer number (42200031).

Almost surely, 2^84400061 is an apocalyptic number.

It is an amenable number.

84400061 is a deficient number, since it is larger than the sum of its proper divisors (1).

84400061 is an equidigital number, since it uses as much as digits as its factorization.

84400061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 768, while the sum is 23.

The square root of 84400061 is about 9186.9505822117. The cubic root of 84400061 is about 438.6460809125.

The spelling of 84400061 in words is "eighty-four million, four hundred thousand, sixty-one".