61516571 has 2 divisors, whose sum is σ = 61516572. Its totient is φ = 61516570.

The previous prime is 61516549. The next prime is 61516573. The reversal of 61516571 is 17561516.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61516571 is a prime.

Together with 61516573, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61516573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30758285 + 30758286.

It is an arithmetic number, because the mean of its divisors is an integer number (30758286).

Almost surely, 2^61516571 is an apocalyptic number.

61516571 is a deficient number, since it is larger than the sum of its proper divisors (1).

61516571 is an equidigital number, since it uses as much as digits as its factorization.

61516571 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6300, while the sum is 32.

The square root of 61516571 is about 7843.2500278902. The cubic root of 61516571 is about 394.7577877350.

The spelling of 61516571 in words is "sixty-one million, five hundred sixteen thousand, five hundred seventy-one".