1561227347 has 2 divisors, whose sum is σ = 1561227348. Its totient is φ = 1561227346.

The previous prime is 1561227337. The next prime is 1561227361. The reversal of 1561227347 is 7437221651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561227347 - 2⁸ = 1561227091 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1561227347.

It is not a weakly prime, because it can be changed into another prime (1561227337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780613673 + 780613674.

It is an arithmetic number, because the mean of its divisors is an integer number (780613674).

Almost surely, 2^1561227347 is an apocalyptic number.

1561227347 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561227347 is an equidigital number, since it uses as much as digits as its factorization.

1561227347 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 70560, while the sum is 38.

The square root of 1561227347 is about 39512.3695442326. The cubic root of 1561227347 is about 1160.0820757919.

Adding to 1561227347 its reverse (7437221651), we get a palindrome (8998448998).

The spelling of 1561227347 in words is "one billion, five hundred sixty-one million, two hundred twenty-seven thousand, three hundred forty-seven".