1561413 has 8 divisors (see below), whose sum is σ = 2379328. Its totient is φ = 892224.

The previous prime is 1561393. The next prime is 1561421. The reversal of 1561413 is 3141651.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1561413 - 2⁶ = 1561349 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21), and also a Moran number because the ratio is a prime number: 74353 = 1561413 / (1 + 5 + 6 + 1 + 4 + 1 + 3).

It is a Curzon number.

1561413 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1561413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37156 + ... + 37197.

It is an arithmetic number, because the mean of its divisors is an integer number (297416).

2^1561413 is an apocalyptic number.

It is an amenable number.

1561413 is a deficient number, since it is larger than the sum of its proper divisors (817915).

1561413 is an equidigital number, since it uses as much as digits as its factorization.

1561413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74363.

The product of its digits is 360, while the sum is 21.

The square root of 1561413 is about 1249.5651243533. The cubic root of 1561413 is about 116.0128057603.

The spelling of 1561413 in words is "one million, five hundred sixty-one thousand, four hundred thirteen".