1265440511 has 2 divisors, whose sum is σ = 1265440512. Its totient is φ = 1265440510.

The previous prime is 1265440499. The next prime is 1265440559. The reversal of 1265440511 is 1150445621.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1265440511 - 2¹⁸ = 1265178367 is a prime.

It is a super-2 number, since 2×1265440511² = 3202679373759882242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265490511) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632720255 + 632720256.

It is an arithmetic number, because the mean of its divisors is an integer number (632720256).

Almost surely, 2^1265440511 is an apocalyptic number.

1265440511 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265440511 is an equidigital number, since it uses as much as digits as its factorization.

1265440511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 1265440511 is about 35573.0306693146. The cubic root of 1265440511 is about 1081.6346163260.

The spelling of 1265440511 in words is "one billion, two hundred sixty-five million, four hundred forty thousand, five hundred eleven".