1561367405 has 8 divisors (see below), whose sum is σ = 2017767192. Its totient is φ = 1153009728.

The previous prime is 1561367393. The next prime is 1561367411. The reversal of 1561367405 is 5047631651.

It can be written as a sum of positive squares in 4 ways, for example, as 51423241 + 1509944164 = 7171^2 + 38858^2 .

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

It is not a de Polignac number, because 1561367405 - 2⁶ = 1561367341 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12010454 + ... + 12010583.

It is an arithmetic number, because the mean of its divisors is an integer number (252220899).

Almost surely, 2^1561367405 is an apocalyptic number.

It is an amenable number.

1561367405 is a deficient number, since it is larger than the sum of its proper divisors (456399787).

1561367405 is a wasteful number, since it uses less digits than its factorization.

1561367405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24021055.

The product of its (nonzero) digits is 75600, while the sum is 38.

The square root of 1561367405 is about 39514.1418355505. The cubic root of 1561367405 is about 1160.1167651486.

The spelling of 1561367405 in words is "one billion, five hundred sixty-one million, three hundred sixty-seven thousand, four hundred five".