61310551571 has 2 divisors, whose sum is σ = 61310551572. Its totient is φ = 61310551570.

The previous prime is 61310551529. The next prime is 61310551573. The reversal of 61310551571 is 17515501316.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-61310551571 is a prime.

Together with 61310551573, 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 (61310551573) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30655275785 + 30655275786.

It is an arithmetic number, because the mean of its divisors is an integer number (30655275786).

Almost surely, 2^61310551571 is an apocalyptic number.

61310551571 is a deficient number, since it is larger than the sum of its proper divisors (1).

61310551571 is an equidigital number, since it uses as much as digits as its factorization.

61310551571 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15750, while the sum is 35.

The spelling of 61310551571 in words is "sixty-one billion, three hundred ten million, five hundred fifty-one thousand, five hundred seventy-one".