84135949 has 2 divisors, whose sum is σ = 84135950. Its totient is φ = 84135948.

The previous prime is 84135943. The next prime is 84135973. The reversal of 84135949 is 94953148.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83722500 + 413449 = 9150^2 + 643^2 .

It is a cyclic number.

It is not a de Polignac number, because 84135949 - 2⁵ = 84135917 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84135943) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42067974 + 42067975.

It is an arithmetic number, because the mean of its divisors is an integer number (42067975).

Almost surely, 2^84135949 is an apocalyptic number.

It is an amenable number.

84135949 is a deficient number, since it is larger than the sum of its proper divisors (1).

84135949 is an equidigital number, since it uses as much as digits as its factorization.

84135949 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 84135949 is about 9172.5650174856. The cubic root of 84135949 is about 438.1880530103.

The spelling of 84135949 in words is "eighty-four million, one hundred thirty-five thousand, nine hundred forty-nine".