827139457 has 2 divisors, whose sum is σ = 827139458. Its totient is φ = 827139456.

The previous prime is 827139449. The next prime is 827139463. The reversal of 827139457 is 754931728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 493017616 + 334121841 = 22204^2 + 18279^2 .

It is a cyclic number.

It is not a de Polignac number, because 827139457 - 2³ = 827139449 is a prime.

It is not a weakly prime, because it can be changed into another prime (827131457) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 413569728 + 413569729.

It is an arithmetic number, because the mean of its divisors is an integer number (413569729).

Almost surely, 2^827139457 is an apocalyptic number.

It is an amenable number.

827139457 is a deficient number, since it is larger than the sum of its proper divisors (1).

827139457 is an equidigital number, since it uses as much as digits as its factorization.

827139457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 423360, while the sum is 46.

The square root of 827139457 is about 28760.0322844047. The cubic root of 827139457 is about 938.6987642744.

The spelling of 827139457 in words is "eight hundred twenty-seven million, one hundred thirty-nine thousand, four hundred fifty-seven".