61641559 has 16 divisors (see below), whose sum is σ = 74376000. Its totient is φ = 51005472.

The previous prime is 61641553. The next prime is 61641563. The reversal of 61641559 is 95514616.

It is not a de Polignac number, because 61641559 - 2³ = 61641551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61641551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6849 + ... + 13045.

It is an arithmetic number, because the mean of its divisors is an integer number (4648500).

Almost surely, 2^61641559 is an apocalyptic number.

61641559 is a deficient number, since it is larger than the sum of its proper divisors (12734441).

61641559 is an equidigital number, since it uses as much as digits as its factorization.

61641559 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6247 (or 6233 counting only the distinct ones).

The product of its digits is 32400, while the sum is 37.

The square root of 61641559 is about 7851.2138551946. The cubic root of 61641559 is about 395.0249602344.

The spelling of 61641559 in words is "sixty-one million, six hundred forty-one thousand, five hundred fifty-nine".