1265382531 has 24 divisors (see below), whose sum is σ = 2095508064. Its totient is φ = 720783360.

The previous prime is 1265382497. The next prime is 1265382533. The reversal of 1265382531 is 1352835621.

It is not a de Polignac number, because 1265382531 - 2²¹ = 1263285379 is a prime.

It is a super-2 number, since 2×1265382531² = 3202385899519931922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1265382533) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11710 + ... + 51651.

It is an arithmetic number, because the mean of its divisors is an integer number (87312836).

Almost surely, 2^1265382531 is an apocalyptic number.

1265382531 is a deficient number, since it is larger than the sum of its proper divisors (830125533).

1265382531 is a wasteful number, since it uses less digits than its factorization.

1265382531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63691 (or 63688 counting only the distinct ones).

The product of its digits is 43200, while the sum is 36.

The square root of 1265382531 is about 35572.2157167641. The cubic root of 1265382531 is about 1081.6180966154.

The spelling of 1265382531 in words is "one billion, two hundred sixty-five million, three hundred eighty-two thousand, five hundred thirty-one".