61211603 has 2 divisors, whose sum is σ = 61211604. Its totient is φ = 61211602.

The previous prime is 61211599. The next prime is 61211629. The reversal of 61211603 is 30611216.

61211603 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61211603 - 2² = 61211599 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (61211693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30605801 + 30605802.

It is an arithmetic number, because the mean of its divisors is an integer number (30605802).

Almost surely, 2^61211603 is an apocalyptic number.

61211603 is a deficient number, since it is larger than the sum of its proper divisors (1).

61211603 is an equidigital number, since it uses as much as digits as its factorization.

61211603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 216, while the sum is 20.

The square root of 61211603 is about 7823.7844423271. The cubic root of 61211603 is about 394.1043703847.

Adding to 61211603 its reverse (30611216), we get a palindrome (91822819).

The spelling of 61211603 in words is "sixty-one million, two hundred eleven thousand, six hundred three".