1315645 has 4 divisors (see below), whose sum is σ = 1578780. Its totient is φ = 1052512.

The previous prime is 1315637. The next prime is 1315651. The reversal of 1315645 is 5465131.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5465131 = 7 ⋅780733.

It can be written as a sum of positive squares in 2 ways, for example, as 480249 + 835396 = 693^2 + 914^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315645 - 2³ = 1315637 is a prime.

1315645 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 131560 + ... + 131569.

It is an arithmetic number, because the mean of its divisors is an integer number (394695).

2^1315645 is an apocalyptic number.

It is an amenable number.

1315645 is a deficient number, since it is larger than the sum of its proper divisors (263135).

1315645 is an equidigital number, since it uses as much as digits as its factorization.

1315645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263134.

The product of its digits is 1800, while the sum is 25.

The square root of 1315645 is about 1147.0156930051. The cubic root of 1315645 is about 109.5753600904.

It can be divided in two parts, 131 and 5645, that added together give a square (5776 = 76²).

The spelling of 1315645 in words is "one million, three hundred fifteen thousand, six hundred forty-five".