561551098429481 has 2 divisors, whose sum is σ = 561551098429482. Its totient is φ = 561551098429480.

The previous prime is 561551098429423. The next prime is 561551098429493. The reversal of 561551098429481 is 184924890155165.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 537091980810025 + 24459117619456 = 23175245^2 + 4945616^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-561551098429481 is a prime.

It is a super-2 number, since 2×561551098429481² (a number of 30 digits) contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (561551098429381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280775549214740 + 280775549214741.

It is an arithmetic number, because the mean of its divisors is an integer number (280775549214741).

Almost surely, 2^{561551098429481} is an apocalyptic number.

It is an amenable number.

561551098429481 is a deficient number, since it is larger than the sum of its proper divisors (1).

561551098429481 is an equidigital number, since it uses as much as digits as its factorization.

561551098429481 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416000, while the sum is 68.

The spelling of 561551098429481 in words is "five hundred sixty-one trillion, five hundred fifty-one billion, ninety-eight million, four hundred twenty-nine thousand, four hundred eighty-one".