1235268157 has 2 divisors, whose sum is σ = 1235268158. Its totient is φ = 1235268156.

The previous prime is 1235268143. The next prime is 1235268173. The reversal of 1235268157 is 7518625321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 934280356 + 300987801 = 30566^2 + 17349^2 .

It is an emirp because it is prime and its reverse (7518625321) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1235268157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1235268197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 617634078 + 617634079.

It is an arithmetic number, because the mean of its divisors is an integer number (617634079).

Almost surely, 2^1235268157 is an apocalyptic number.

It is an amenable number.

1235268157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1235268157 is an equidigital number, since it uses as much as digits as its factorization.

1235268157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 100800, while the sum is 40.

The square root of 1235268157 is about 35146.3818479228. The cubic root of 1235268157 is about 1072.9687714114.

The spelling of 1235268157 in words is "one billion, two hundred thirty-five million, two hundred sixty-eight thousand, one hundred fifty-seven".