1561227345 has 16 divisors (see below), whose sum is σ = 2775515520. Its totient is φ = 832654512.

The previous prime is 1561227337. The next prime is 1561227347. The reversal of 1561227345 is 5437221651.

1561227345 is a `hidden beast` number, since 1 + 5 + 612 + 2 + 7 + 34 + 5 = 666.

It is not a de Polignac number, because 1561227345 - 2³ = 1561227337 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1561227347) 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, 5782189 + ... + 5782458.

It is an arithmetic number, because the mean of its divisors is an integer number (173469720).

Almost surely, 2^1561227345 is an apocalyptic number.

1561227345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1561227345 is a deficient number, since it is larger than the sum of its proper divisors (1214288175).

1561227345 is a wasteful number, since it uses less digits than its factorization.

1561227345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11564661 (or 11564655 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 1561227345 is about 39512.3695189241. The cubic root of 1561227345 is about 1160.0820752965.

Adding to 1561227345 its reverse (5437221651), we get a palindrome (6998448996).

The spelling of 1561227345 in words is "one billion, five hundred sixty-one million, two hundred twenty-seven thousand, three hundred forty-five".