1561523527 has 2 divisors, whose sum is σ = 1561523528. Its totient is φ = 1561523526.

The previous prime is 1561523489. The next prime is 1561523549. The reversal of 1561523527 is 7253251651.

It is a strong prime.

It is an emirp because it is prime and its reverse (7253251651) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1561523527 - 2¹⁵ = 1561490759 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1561523927) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780761763 + 780761764.

It is an arithmetic number, because the mean of its divisors is an integer number (780761764).

Almost surely, 2^1561523527 is an apocalyptic number.

1561523527 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561523527 is an equidigital number, since it uses as much as digits as its factorization.

1561523527 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63000, while the sum is 37.

The square root of 1561523527 is about 39516.1173067395. The cubic root of 1561523527 is about 1160.1554307679.

The spelling of 1561523527 in words is "one billion, five hundred sixty-one million, five hundred twenty-three thousand, five hundred twenty-seven".