84140291 has 2 divisors, whose sum is σ = 84140292. Its totient is φ = 84140290.

The previous prime is 84140269. The next prime is 84140297. The reversal of 84140291 is 19204148.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-84140291 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (84140297) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 42070145 + 42070146.

It is an arithmetic number, because the mean of its divisors is an integer number (42070146).

Almost surely, 2^84140291 is an apocalyptic number.

84140291 is a deficient number, since it is larger than the sum of its proper divisors (1).

84140291 is an equidigital number, since it uses as much as digits as its factorization.

84140291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 84140291 is about 9172.8016984998. The cubic root of 84140291 is about 438.1955907308.

The spelling of 84140291 in words is "eighty-four million, one hundred forty thousand, two hundred ninety-one".