1561268027 has 4 divisors (see below), whose sum is σ = 1703201496. Its totient is φ = 1419334560.

The previous prime is 1561268017. The next prime is 1561268047. The reversal of 1561268027 is 7208621651.

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

It is a cyclic number.

It is not a de Polignac number, because 1561268027 - 2²⁸ = 1292832571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1561268017) 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, 70966718 + ... + 70966739.

It is an arithmetic number, because the mean of its divisors is an integer number (425800374).

Almost surely, 2^1561268027 is an apocalyptic number.

1561268027 is a deficient number, since it is larger than the sum of its proper divisors (141933469).

1561268027 is a wasteful number, since it uses less digits than its factorization.

1561268027 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141933468.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1561268027 is about 39512.8843163847. The cubic root of 1561268027 is about 1160.0921515674.

Adding to 1561268027 its reverse (7208621651), we get a palindrome (8769889678).

The spelling of 1561268027 in words is "one billion, five hundred sixty-one million, two hundred sixty-eight thousand, twenty-seven".