1235423257 has 2 divisors, whose sum is σ = 1235423258. Its totient is φ = 1235423256.

The previous prime is 1235423209. The next prime is 1235423279. The reversal of 1235423257 is 7523245321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1229834761 + 5588496 = 35069^2 + 2364^2 .

It is an emirp because it is prime and its reverse (7523245321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235423257 is a prime.

It is not a weakly prime, because it can be changed into another prime (1235423557) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617711628 + 617711629.

It is an arithmetic number, because the mean of its divisors is an integer number (617711629).

Almost surely, 2^1235423257 is an apocalyptic number.

It is an amenable number.

1235423257 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235423257 is an equidigital number, since it uses as much as digits as its factorization.

1235423257 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 50400, while the sum is 34.

The square root of 1235423257 is about 35148.5882646800. The cubic root of 1235423257 is about 1073.0136767735.

Adding to 1235423257 its reverse (7523245321), we get a palindrome (8758668578).

The spelling of 1235423257 in words is "one billion, two hundred thirty-five million, four hundred twenty-three thousand, two hundred fifty-seven".