84140557 has 2 divisors, whose sum is σ = 84140558. Its totient is φ = 84140556.

The previous prime is 84140447. The next prime is 84140579. The reversal of 84140557 is 75504148.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 72403081 + 11737476 = 8509^2 + 3426^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84140557 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (84140587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42070278 + 42070279.

It is an arithmetic number, because the mean of its divisors is an integer number (42070279).

Almost surely, 2^84140557 is an apocalyptic number.

It is an amenable number.

84140557 is a deficient number, since it is larger than the sum of its proper divisors (1).

84140557 is an equidigital number, since it uses as much as digits as its factorization.

84140557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 84140557 is about 9172.8161978751. The cubic root of 84140557 is about 438.1960524989.

The spelling of 84140557 in words is "eighty-four million, one hundred forty thousand, five hundred fifty-seven".