1315561 has 4 divisors (see below), whose sum is σ = 1416772. Its totient is φ = 1214352.

The previous prime is 1315553. The next prime is 1315591. The reversal of 1315561 is 1655131.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 705600 + 609961 = 840^2 + 781^2 .

It is a cyclic number.

It is not a de Polignac number, because 1315561 - 2³ = 1315553 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315591) 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, 50586 + ... + 50611.

It is an arithmetic number, because the mean of its divisors is an integer number (354193).

2^1315561 is an apocalyptic number.

It is an amenable number.

1315561 is a deficient number, since it is larger than the sum of its proper divisors (101211).

1315561 is a wasteful number, since it uses less digits than its factorization.

1315561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101210.

The product of its digits is 450, while the sum is 22.

The square root of 1315561 is about 1146.9790756592. The cubic root of 1315561 is about 109.5730280211.

The spelling of 1315561 in words is "one million, three hundred fifteen thousand, five hundred sixty-one".