265243157 has 2 divisors, whose sum is σ = 265243158. Its totient is φ = 265243156.

The previous prime is 265243123. The next prime is 265243171. The reversal of 265243157 is 751342562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 243796996 + 21446161 = 15614^2 + 4631^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265243157 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265243117) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132621578 + 132621579.

It is an arithmetic number, because the mean of its divisors is an integer number (132621579).

Almost surely, 2^265243157 is an apocalyptic number.

It is an amenable number.

265243157 is a deficient number, since it is larger than the sum of its proper divisors (1).

265243157 is an equidigital number, since it uses as much as digits as its factorization.

265243157 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 35.

The square root of 265243157 is about 16286.2873915451. The cubic root of 265243157 is about 642.5122261447.

The spelling of 265243157 in words is "two hundred sixty-five million, two hundred forty-three thousand, one hundred fifty-seven".