561481903 has 2 divisors, whose sum is σ = 561481904. Its totient is φ = 561481902.

The previous prime is 561481897. The next prime is 561481961. The reversal of 561481903 is 309184165.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 561481903 - 2⁹ = 561481391 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (561482903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 280740951 + 280740952.

It is an arithmetic number, because the mean of its divisors is an integer number (280740952).

Almost surely, 2^561481903 is an apocalyptic number.

561481903 is a deficient number, since it is larger than the sum of its proper divisors (1).

561481903 is an equidigital number, since it uses as much as digits as its factorization.

561481903 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25920, while the sum is 37.

The square root of 561481903 is about 23695.6093612298. The cubic root of 561481903 is about 824.9834844566.

The spelling of 561481903 in words is "five hundred sixty-one million, four hundred eighty-one thousand, nine hundred three".