2311331257 has 2 divisors, whose sum is σ = 2311331258. Its totient is φ = 2311331256.

The previous prime is 2311331161. The next prime is 2311331287. The reversal of 2311331257 is 7521331132.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1945603881 + 365727376 = 44109^2 + 19124^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2311331257 is a prime.

It is a super-3 number, since 3×2311331257³ (a number of 29 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (2311331287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1155665628 + 1155665629.

It is an arithmetic number, because the mean of its divisors is an integer number (1155665629).

Almost surely, 2^2311331257 is an apocalyptic number.

It is an amenable number.

2311331257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2311331257 is an equidigital number, since it uses as much as digits as its factorization.

2311331257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3780, while the sum is 28.

The square root of 2311331257 is about 48076.3066073092. The cubic root of 2311331257 is about 1322.1703004228.

Adding to 2311331257 its reverse (7521331132), we get a palindrome (9832662389).

The spelling of 2311331257 in words is "two billion, three hundred eleven million, three hundred thirty-one thousand, two hundred fifty-seven".