1561350523 has 2 divisors, whose sum is σ = 1561350524. Its totient is φ = 1561350522.

The previous prime is 1561350463. The next prime is 1561350551. The reversal of 1561350523 is 3250531651.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1561350523 - 2¹³ = 1561342331 is a prime.

It is not a weakly prime, because it can be changed into another prime (1561350223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 780675261 + 780675262.

It is an arithmetic number, because the mean of its divisors is an integer number (780675262).

Almost surely, 2^1561350523 is an apocalyptic number.

1561350523 is a deficient number, since it is larger than the sum of its proper divisors (1).

1561350523 is an equidigital number, since it uses as much as digits as its factorization.

1561350523 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13500, while the sum is 31.

The square root of 1561350523 is about 39513.9282152509. The cubic root of 1561350523 is about 1160.1125839499.

The spelling of 1561350523 in words is "one billion, five hundred sixty-one million, three hundred fifty thousand, five hundred twenty-three".