61571641 has 4 divisors (see below), whose sum is σ = 62313552. Its totient is φ = 60829732.

The previous prime is 61571617. The next prime is 61571651. The reversal of 61571641 is 14617516.

61571641 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 61571641 - 2⁷ = 61571513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61571651) 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 in 3 ways as a sum of consecutive naturals, for example, 370831 + ... + 370996.

It is an arithmetic number, because the mean of its divisors is an integer number (15578388).

Almost surely, 2^61571641 is an apocalyptic number.

It is an amenable number.

61571641 is a deficient number, since it is larger than the sum of its proper divisors (741911).

61571641 is an equidigital number, since it uses as much as digits as its factorization.

61571641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 741910.

The product of its digits is 5040, while the sum is 31.

The square root of 61571641 is about 7846.7599045721. The cubic root of 61571641 is about 394.8755491078.

The spelling of 61571641 in words is "sixty-one million, five hundred seventy-one thousand, six hundred forty-one".