84917251 has 4 divisors (see below), whose sum is σ = 89386600. Its totient is φ = 80447904.

The previous prime is 84917243. The next prime is 84917267. The reversal of 84917251 is 15271948.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 84917251 - 2³ = 84917243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 84917251.

It is not an unprimeable number, because it can be changed into a prime (84917201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2234646 + ... + 2234683.

It is an arithmetic number, because the mean of its divisors is an integer number (22346650).

Almost surely, 2^84917251 is an apocalyptic number.

84917251 is a deficient number, since it is larger than the sum of its proper divisors (4469349).

84917251 is a wasteful number, since it uses less digits than its factorization.

84917251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4469348.

The product of its digits is 20160, while the sum is 37.

The square root of 84917251 is about 9215.0556699349. The cubic root of 84917251 is about 439.5402411811.

It can be divided in two parts, 84 and 917251, that added together give a triangular number (917335 = T₁₃₅₄).

The spelling of 84917251 in words is "eighty-four million, nine hundred seventeen thousand, two hundred fifty-one".