561120551 has 2 divisors, whose sum is σ = 561120552. Its totient is φ = 561120550.

The previous prime is 561120533. The next prime is 561120569. The reversal of 561120551 is 155021165.

It is a balanced prime because it is at equal distance from previous prime (561120533) and next prime (561120569).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561120551 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 561120551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561120251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280560275 + 280560276.

It is an arithmetic number, because the mean of its divisors is an integer number (280560276).

Almost surely, 2^561120551 is an apocalyptic number.

561120551 is a deficient number, since it is larger than the sum of its proper divisors (1).

561120551 is an equidigital number, since it uses as much as digits as its factorization.

561120551 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1500, while the sum is 26.

The square root of 561120551 is about 23687.9832615611. The cubic root of 561120551 is about 824.8064687151.

It can be divided in two parts, 5611 and 20551, that added together give a palindrome (26162).

The spelling of 561120551 in words is "five hundred sixty-one million, one hundred twenty thousand, five hundred fifty-one".