265581997 has 2 divisors, whose sum is σ = 265581998. Its totient is φ = 265581996.

The previous prime is 265581959. The next prime is 265582003. The reversal of 265581997 is 799185562.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 207532836 + 58049161 = 14406^2 + 7619^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265581997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265581947) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132790998 + 132790999.

It is an arithmetic number, because the mean of its divisors is an integer number (132790999).

Almost surely, 2^265581997 is an apocalyptic number.

It is an amenable number.

265581997 is a deficient number, since it is larger than the sum of its proper divisors (1).

265581997 is an equidigital number, since it uses as much as digits as its factorization.

265581997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1360800, while the sum is 52.

The square root of 265581997 is about 16296.6866877903. The cubic root of 265581997 is about 642.7857062795.

The spelling of 265581997 in words is "two hundred sixty-five million, five hundred eighty-one thousand, nine hundred ninety-seven".