5491257257 has 2 divisors, whose sum is σ = 5491257258. Its totient is φ = 5491257256.

The previous prime is 5491257253. The next prime is 5491257293. The reversal of 5491257257 is 7527521945.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4959539776 + 531717481 = 70424^2 + 23059^2 .

It is a cyclic number.

It is not a de Polignac number, because 5491257257 - 2² = 5491257253 is a prime.

It is not a weakly prime, because it can be changed into another prime (5491257253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2745628628 + 2745628629.

It is an arithmetic number, because the mean of its divisors is an integer number (2745628629).

Almost surely, 2^5491257257 is an apocalyptic number.

It is an amenable number.

5491257257 is a deficient number, since it is larger than the sum of its proper divisors (1).

5491257257 is an equidigital number, since it uses as much as digits as its factorization.

5491257257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 882000, while the sum is 47.

The square root of 5491257257 is about 74103.0178670208. The cubic root of 5491257257 is about 1764.2383707890.

The spelling of 5491257257 in words is "five billion, four hundred ninety-one million, two hundred fifty-seven thousand, two hundred fifty-seven".