61603601 has 2 divisors, whose sum is σ = 61603602. Its totient is φ = 61603600.

The previous prime is 61603589. The next prime is 61603657. The reversal of 61603601 is 10630616.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58125376 + 3478225 = 7624^2 + 1865^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61603601 is a prime.

It is not a weakly prime, because it can be changed into another prime (61603691) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30801800 + 30801801.

It is an arithmetic number, because the mean of its divisors is an integer number (30801801).

Almost surely, 2^61603601 is an apocalyptic number.

It is an amenable number.

61603601 is a deficient number, since it is larger than the sum of its proper divisors (1).

61603601 is an equidigital number, since it uses as much as digits as its factorization.

61603601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 61603601 is about 7848.7961497290. The cubic root of 61603601 is about 394.9438599913.

The spelling of 61603601 in words is "sixty-one million, six hundred three thousand, six hundred one".