1265493311 has 8 divisors (see below), whose sum is σ = 1371096144. Its totient is φ = 1163352960.

The previous prime is 1265493287. The next prime is 1265493323. The reversal of 1265493311 is 1133945621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1265493311 - 2⁶ = 1265493247 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265493371) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 864860 + ... + 866321.

It is an arithmetic number, because the mean of its divisors is an integer number (171387018).

Almost surely, 2^1265493311 is an apocalyptic number.

1265493311 is a deficient number, since it is larger than the sum of its proper divisors (105602833).

1265493311 is a wasteful number, since it uses less digits than its factorization.

1265493311 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731241.

The product of its digits is 19440, while the sum is 35.

The square root of 1265493311 is about 35573.7727968232. The cubic root of 1265493311 is about 1081.6496597076.

The spelling of 1265493311 in words is "one billion, two hundred sixty-five million, four hundred ninety-three thousand, three hundred eleven".