1561725227 has 2 divisors, whose sum is σ = 1561725228. Its totient is φ = 1561725226.

The previous prime is 1561725211. The next prime is 1561725251. The reversal of 1561725227 is 7225271651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561725227 - 2⁴ = 1561725211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561725287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780862613 + 780862614.

It is an arithmetic number, because the mean of its divisors is an integer number (780862614).

Almost surely, 2^1561725227 is an apocalyptic number.

1561725227 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561725227 is an equidigital number, since it uses as much as digits as its factorization.

1561725227 is an evil number, because the sum of its binary digits is even.

The product of its digits is 58800, while the sum is 38.

The square root of 1561725227 is about 39518.6693475375. The cubic root of 1561725227 is about 1160.2053805492.

Adding to 1561725227 its reverse (7225271651), we get a palindrome (8786996878).

The spelling of 1561725227 in words is "one billion, five hundred sixty-one million, seven hundred twenty-five thousand, two hundred twenty-seven".