1561224405 has 16 divisors (see below), whose sum is σ = 2690110080. Its totient is φ = 768602688.

The previous prime is 1561224389. The next prime is 1561224407. The reversal of 1561224405 is 5044221651.

It is not a de Polignac number, because 1561224405 - 2⁴ = 1561224389 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1561224407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4002945 + ... + 4003334.

It is an arithmetic number, because the mean of its divisors is an integer number (168131880).

Almost surely, 2^1561224405 is an apocalyptic number.

1561224405 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561224405 is a deficient number, since it is larger than the sum of its proper divisors (1128885675).

1561224405 is a wasteful number, since it uses less digits than its factorization.

1561224405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8006300.

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 1561224405 is about 39512.3323153671. The cubic root of 1561224405 is about 1160.0813470995.

The spelling of 1561224405 in words is "one billion, five hundred sixty-one million, two hundred twenty-four thousand, four hundred five".