84261869 has 2 divisors, whose sum is σ = 84261870. Its totient is φ = 84261868.

The previous prime is 84261817. The next prime is 84261883. The reversal of 84261869 is 96816248.

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., 51337225 + 32924644 = 7165^2 + 5738^2 .

It is a cyclic number.

It is not a de Polignac number, because 84261869 - 2⁸ = 84261613 is a prime.

It is a super-2 number, since 2×84261869² = 14200125134746322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84261889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42130934 + 42130935.

It is an arithmetic number, because the mean of its divisors is an integer number (42130935).

Almost surely, 2^84261869 is an apocalyptic number.

It is an amenable number.

84261869 is a deficient number, since it is larger than the sum of its proper divisors (1).

84261869 is an equidigital number, since it uses as much as digits as its factorization.

84261869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 165888, while the sum is 44.

The square root of 84261869 is about 9179.4263982016. The cubic root of 84261869 is about 438.4065451725.

The spelling of 84261869 in words is "eighty-four million, two hundred sixty-one thousand, eight hundred sixty-nine".