1265731 has 4 divisors (see below), whose sum is σ = 1269000. Its totient is φ = 1262464.

The previous prime is 1265729. The next prime is 1265741. The reversal of 1265731 is 1375621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1375621 = 13 ⋅105817.

It is a cyclic number.

It is not a de Polignac number, because 1265731 - 2¹ = 1265729 is a prime.

It is a super-2 number, since 2×1265731² = 3204149928722, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1265696 and 1265705.

It is not an unprimeable number, because it can be changed into a prime (1265741) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 961 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (317250).

2^1265731 is an apocalyptic number.

1265731 is a deficient number, since it is larger than the sum of its proper divisors (3269).

1265731 is an equidigital number, since it uses as much as digits as its factorization.

1265731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3268.

The product of its digits is 1260, while the sum is 25.

The square root of 1265731 is about 1125.0471101247. The cubic root of 1265731 is about 108.1717375101.

The spelling of 1265731 in words is "one million, two hundred sixty-five thousand, seven hundred thirty-one".