61315571 has 4 divisors (see below), whose sum is σ = 62004600. Its totient is φ = 60626544.

The previous prime is 61315567. The next prime is 61315621. The reversal of 61315571 is 17551316.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61315571 - 2² = 61315567 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (61315511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344381 + ... + 344558.

It is an arithmetic number, because the mean of its divisors is an integer number (15501150).

Almost surely, 2^61315571 is an apocalyptic number.

61315571 is a deficient number, since it is larger than the sum of its proper divisors (689029).

61315571 is an equidigital number, since it uses as much as digits as its factorization.

61315571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 689028.

The product of its digits is 3150, while the sum is 29.

The square root of 61315571 is about 7830.4259781956. The cubic root of 61315571 is about 394.3273731313.

Adding to 61315571 its reverse (17551316), we get a palindrome (78866887).

The spelling of 61315571 in words is "sixty-one million, three hundred fifteen thousand, five hundred seventy-one".