84909457 has 2 divisors, whose sum is σ = 84909458. Its totient is φ = 84909456.

The previous prime is 84909431. The next prime is 84909479. The reversal of 84909457 is 75490948.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 66324736 + 18584721 = 8144^2 + 4311^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84909457 is a prime.

It is not a weakly prime, because it can be changed into another prime (84909427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42454728 + 42454729.

It is an arithmetic number, because the mean of its divisors is an integer number (42454729).

Almost surely, 2^84909457 is an apocalyptic number.

It is an amenable number.

84909457 is a deficient number, since it is larger than the sum of its proper divisors (1).

84909457 is an equidigital number, since it uses as much as digits as its factorization.

84909457 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 84909457 is about 9214.6327653358. The cubic root of 84909457 is about 439.5267932601.

The spelling of 84909457 in words is "eighty-four million, nine hundred nine thousand, four hundred fifty-seven".