1561244427 has 6 divisors (see below), whose sum is σ = 2255130852. Its totient is φ = 1040829612.

The previous prime is 1561244389. The next prime is 1561244437. The reversal of 1561244427 is 7244421651.

1561244427 is a `hidden beast` number, since 15 + 612 + 4 + 4 + 4 + 27 = 666.

It is not a de Polignac number, because 1561244427 - 2⁷ = 1561244299 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1561244391 and 1561244400.

It is not an unprimeable number, because it can be changed into a prime (1561244437) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 86735793 + ... + 86735810.

It is an arithmetic number, because the mean of its divisors is an integer number (375855142).

Almost surely, 2^1561244427 is an apocalyptic number.

1561244427 is a deficient number, since it is larger than the sum of its proper divisors (693886425).

1561244427 is a wasteful number, since it uses less digits than its factorization.

1561244427 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173471609 (or 173471606 counting only the distinct ones).

The product of its digits is 53760, while the sum is 36.

The square root of 1561244427 is about 39512.5856784898. The cubic root of 1561244427 is about 1160.0863062519.

The spelling of 1561244427 in words is "one billion, five hundred sixty-one million, two hundred forty-four thousand, four hundred twenty-seven".