1263252157 has 2 divisors, whose sum is σ = 1263252158. Its totient is φ = 1263252156.

The previous prime is 1263252073. The next prime is 1263252181. The reversal of 1263252157 is 7512523621.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1020546916 + 242705241 = 31946^2 + 15579^2 .

It is a cyclic number.

It is not a de Polignac number, because 1263252157 - 2²³ = 1254863549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1263252197) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 631626078 + 631626079.

It is an arithmetic number, because the mean of its divisors is an integer number (631626079).

Almost surely, 2^1263252157 is an apocalyptic number.

It is an amenable number.

1263252157 is a deficient number, since it is larger than the sum of its proper divisors (1).

1263252157 is an equidigital number, since it uses as much as digits as its factorization.

1263252157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 25200, while the sum is 34.

The square root of 1263252157 is about 35542.2587492692. The cubic root of 1263252157 is about 1081.0107584241.

Adding to 1263252157 its reverse (7512523621), we get a palindrome (8775775778).

The spelling of 1263252157 in words is "one billion, two hundred sixty-three million, two hundred fifty-two thousand, one hundred fifty-seven".