1561262327 has 2 divisors, whose sum is σ = 1561262328. Its totient is φ = 1561262326.

The previous prime is 1561262321. The next prime is 1561262363. The reversal of 1561262327 is 7232621651.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1561262327 - 2¹⁸ = 1561000183 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561262321) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780631163 + 780631164.

It is an arithmetic number, because the mean of its divisors is an integer number (780631164).

Almost surely, 2^1561262327 is an apocalyptic number.

1561262327 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561262327 is an equidigital number, since it uses as much as digits as its factorization.

1561262327 is an evil number, because the sum of its binary digits is even.

The product of its digits is 30240, while the sum is 35.

The square root of 1561262327 is about 39512.8121879473. The cubic root of 1561262327 is about 1160.0907397805.

Adding to 1561262327 its reverse (7232621651), we get a palindrome (8793883978).

The spelling of 1561262327 in words is "one billion, five hundred sixty-one million, two hundred sixty-two thousand, three hundred twenty-seven".