1265495397 has 16 divisors (see below), whose sum is σ = 1786974720. Its totient is φ = 794935152.

The previous prime is 1265495393. The next prime is 1265495401. The reversal of 1265495397 is 7935945621.

It is an interprime number because it is at equal distance from previous prime (1265495393) and next prime (1265495401).

It is not a de Polignac number, because 1265495397 - 2² = 1265495393 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265495393) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 132247 + ... + 141492.

It is an arithmetic number, because the mean of its divisors is an integer number (111685920).

Almost surely, 2^1265495397 is an apocalyptic number.

It is an amenable number.

1265495397 is a deficient number, since it is larger than the sum of its proper divisors (521479323).

1265495397 is a wasteful number, since it uses less digits than its factorization.

1265495397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 273832.

The product of its digits is 2041200, while the sum is 51.

The square root of 1265495397 is about 35573.8021161641. The cubic root of 1265495397 is about 1081.6502540265.

The spelling of 1265495397 in words is "one billion, two hundred sixty-five million, four hundred ninety-five thousand, three hundred ninety-seven".