791142557 has 2 divisors, whose sum is σ = 791142558. Its totient is φ = 791142556.

The previous prime is 791142497. The next prime is 791142571. The reversal of 791142557 is 755241197.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 694533316 + 96609241 = 26354^2 + 9829^2 .

It is a cyclic number.

It is not a de Polignac number, because 791142557 - 2¹² = 791138461 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (791142757) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 395571278 + 395571279.

It is an arithmetic number, because the mean of its divisors is an integer number (395571279).

Almost surely, 2^791142557 is an apocalyptic number.

It is an amenable number.

791142557 is a deficient number, since it is larger than the sum of its proper divisors (1).

791142557 is an equidigital number, since it uses as much as digits as its factorization.

791142557 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 88200, while the sum is 41.

The square root of 791142557 is about 28127.2564783699. The cubic root of 791142557 is about 924.8789934721.

The spelling of 791142557 in words is "seven hundred ninety-one million, one hundred forty-two thousand, five hundred fifty-seven".