1561224407 has 2 divisors, whose sum is σ = 1561224408. Its totient is φ = 1561224406.

The previous prime is 1561224389. The next prime is 1561224421. The reversal of 1561224407 is 7044221651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561224407 - 2¹⁰ = 1561223383 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561224437) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780612203 + 780612204.

It is an arithmetic number, because the mean of its divisors is an integer number (780612204).

Almost surely, 2^1561224407 is an apocalyptic number.

1561224407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561224407 is an equidigital number, since it uses as much as digits as its factorization.

1561224407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13440, while the sum is 32.

The square root of 1561224407 is about 39512.3323406756. The cubic root of 1561224407 is about 1160.0813475948.

The spelling of 1561224407 in words is "one billion, five hundred sixty-one million, two hundred twenty-four thousand, four hundred seven".