1561567627 has 4 divisors (see below), whose sum is σ = 1561890640. Its totient is φ = 1561244616.

The previous prime is 1561567613. The next prime is 1561567633. The reversal of 1561567627 is 7267651651.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1561567627 is a prime.

It is a super-2 number, since 2×1561567627² = 4876986907388822258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561561627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 154143 + ... + 163960.

It is an arithmetic number, because the mean of its divisors is an integer number (390472660).

Almost surely, 2^1561567627 is an apocalyptic number.

1561567627 is a deficient number, since it is larger than the sum of its proper divisors (323013).

1561567627 is an equidigital number, since it uses as much as digits as its factorization.

1561567627 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 323012.

The product of its digits is 529200, while the sum is 46.

The square root of 1561567627 is about 39516.6753029655. The cubic root of 1561567627 is about 1160.1663522327.

The spelling of 1561567627 in words is "one billion, five hundred sixty-one million, five hundred sixty-seven thousand, six hundred twenty-seven".