1265531426 has 4 divisors (see below), whose sum is σ = 1898297142. Its totient is φ = 632765712.

The previous prime is 1265531419. The next prime is 1265531441. The reversal of 1265531426 is 6241355621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 6241355621 = 139 ⋅44901839.

It can be written as a sum of positive squares in only one way, i.e., 761484025 + 504047401 = 27595^2 + 22451^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316382855 + ... + 316382858.

Almost surely, 2^1265531426 is an apocalyptic number.

1265531426 is a deficient number, since it is larger than the sum of its proper divisors (632765716).

1265531426 is an equidigital number, since it uses as much as digits as its factorization.

1265531426 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 632765715.

The product of its digits is 43200, while the sum is 35.

The square root of 1265531426 is about 35574.3085104967. The cubic root of 1265531426 is about 1081.6605188886.

The spelling of 1265531426 in words is "one billion, two hundred sixty-five million, five hundred thirty-one thousand, four hundred twenty-six".