61621603 has 2 divisors, whose sum is σ = 61621604. Its totient is φ = 61621602.

The previous prime is 61621597. The next prime is 61621627. The reversal of 61621603 is 30612616.

61621603 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 a de Polignac number, because none of the positive numbers 2^k-61621603 is a prime.

It is equal to p_3652513 and since 61621603 and 3652513 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (61621633) 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, 30810801 + 30810802.

It is an arithmetic number, because the mean of its divisors is an integer number (30810802).

Almost surely, 2^61621603 is an apocalyptic number.

61621603 is a deficient number, since it is larger than the sum of its proper divisors (1).

61621603 is an equidigital number, since it uses as much as digits as its factorization.

61621603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 61621603 is about 7849.9428660341. The cubic root of 61621603 is about 394.9823268277.

The spelling of 61621603 in words is "sixty-one million, six hundred twenty-one thousand, six hundred three".