61861603 has 2 divisors, whose sum is σ = 61861604. Its totient is φ = 61861602.

The previous prime is 61861601. The next prime is 61861607. The reversal of 61861603 is 30616816.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61861603 - 2¹ = 61861601 is a prime.

Together with 61861601, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61861601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30930801 + 30930802.

It is an arithmetic number, because the mean of its divisors is an integer number (30930802).

Almost surely, 2^61861603 is an apocalyptic number.

61861603 is a deficient number, since it is larger than the sum of its proper divisors (1).

61861603 is an equidigital number, since it uses as much as digits as its factorization.

61861603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 61861603 is about 7865.2147459558. The cubic root of 61861603 is about 395.4944467727.

The spelling of 61861603 in words is "sixty-one million, eight hundred sixty-one thousand, six hundred three".