1561316 has 12 divisors (see below), whose sum is σ = 2758140. Its totient is φ = 773280.

The previous prime is 1561303. The next prime is 1561337. The reversal of 1561316 is 6131651.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1254400 + 306916 = 1120^2 + 554^2 .

It is a junction number, because it is equal to n+sod(n) for n = 1561291 and 1561300.

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, 1355 + ... + 2226.

It is an arithmetic number, because the mean of its divisors is an integer number (229845).

2^1561316 is an apocalyptic number.

It is an amenable number.

1561316 is a deficient number, since it is larger than the sum of its proper divisors (1196824).

1561316 is a wasteful number, since it uses less digits than its factorization.

1561316 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3694 (or 3692 counting only the distinct ones).

The product of its digits is 540, while the sum is 23.

The square root of 1561316 is about 1249.5263102472. The cubic root of 1561316 is about 116.0104033476.

Adding to 1561316 its reverse (6131651), we get a palindrome (7692967).

The spelling of 1561316 in words is "one million, five hundred sixty-one thousand, three hundred sixteen".