561061511 has 2 divisors, whose sum is σ = 561061512. Its totient is φ = 561061510.

The previous prime is 561061493. The next prime is 561061541. The reversal of 561061511 is 115160165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561061511 - 2¹⁸ = 560799367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561061541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280530755 + 280530756.

It is an arithmetic number, because the mean of its divisors is an integer number (280530756).

Almost surely, 2^561061511 is an apocalyptic number.

561061511 is a deficient number, since it is larger than the sum of its proper divisors (1).

561061511 is an equidigital number, since it uses as much as digits as its factorization.

561061511 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 900, while the sum is 26.

The square root of 561061511 is about 23686.7370272902. The cubic root of 561061511 is about 824.7775395294. Note that the first 3 decimals are identical.

The spelling of 561061511 in words is "five hundred sixty-one million, sixty-one thousand, five hundred eleven".