61397571 has 4 divisors (see below), whose sum is σ = 81863432. Its totient is φ = 40931712.

The previous prime is 61397477. The next prime is 61397573. The reversal of 61397571 is 17579316.

61397571 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 is not a de Polignac number, because 61397571 - 2¹⁰ = 61396547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61397573) 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, 10232926 + ... + 10232931.

It is an arithmetic number, because the mean of its divisors is an integer number (20465858).

Almost surely, 2^61397571 is an apocalyptic number.

61397571 is a deficient number, since it is larger than the sum of its proper divisors (20465861).

61397571 is a wasteful number, since it uses less digits than its factorization.

61397571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20465860.

The product of its digits is 39690, while the sum is 39.

The square root of 61397571 is about 7835.6602146852. The cubic root of 61397571 is about 394.5030785870.

The spelling of 61397571 in words is "sixty-one million, three hundred ninety-seven thousand, five hundred seventy-one".