61271820541 has 4 divisors (see below), whose sum is σ = 61903488892. Its totient is φ = 60640152192.

The previous prime is 61271820517. The next prime is 61271820553. The reversal of 61271820541 is 14502817216.

61271820541 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.

It can be written as a sum of positive squares in 2 ways, for example, as 28216944441 + 33054876100 = 167979^2 + 181810^2 .

It is a cyclic number.

It is not a de Polignac number, because 61271820541 - 2³¹ = 59124336893 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 61271820541.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61271820241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 315834030 + ... + 315834223.

It is an arithmetic number, because the mean of its divisors is an integer number (15475872223).

Almost surely, 2^61271820541 is an apocalyptic number.

It is an amenable number.

61271820541 is a deficient number, since it is larger than the sum of its proper divisors (631668351).

61271820541 is an equidigital number, since it uses as much as digits as its factorization.

61271820541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 631668350.

The product of its (nonzero) digits is 26880, while the sum is 37.

The spelling of 61271820541 in words is "sixty-one billion, two hundred seventy-one million, eight hundred twenty thousand, five hundred forty-one".