1561411 has 4 divisors (see below), whose sum is σ = 1563912. Its totient is φ = 1558912.

The previous prime is 1561393. The next prime is 1561421. The reversal of 1561411 is 1141651.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1561411 - 2¹⁵ = 1528643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561421) 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, 576 + ... + 1858.

It is an arithmetic number, because the mean of its divisors is an integer number (390978).

2^1561411 is an apocalyptic number.

1561411 is a deficient number, since it is larger than the sum of its proper divisors (2501).

1561411 is a wasteful number, since it uses less digits than its factorization.

1561411 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2500.

The product of its digits is 120, while the sum is 19.

The square root of 1561411 is about 1249.5643240746. The cubic root of 1561411 is about 116.0127562270.

It can be divided in two parts, 15614 and 11, that added together give a 6-th power (15625 = 5⁶).

The spelling of 1561411 in words is "one million, five hundred sixty-one thousand, four hundred eleven".