61567811 has 2 divisors, whose sum is σ = 61567812. Its totient is φ = 61567810.

The previous prime is 61567801. The next prime is 61567813. The reversal of 61567811 is 11876516.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61567811 - 2⁶ = 61567747 is a prime.

Together with 61567813, 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 (61567813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783905 + 30783906.

It is an arithmetic number, because the mean of its divisors is an integer number (30783906).

Almost surely, 2^61567811 is an apocalyptic number.

61567811 is a deficient number, since it is larger than the sum of its proper divisors (1).

61567811 is an equidigital number, since it uses as much as digits as its factorization.

61567811 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10080, while the sum is 35.

The square root of 61567811 is about 7846.5158510004. The cubic root of 61567811 is about 394.8673613301.

The spelling of 61567811 in words is "sixty-one million, five hundred sixty-seven thousand, eight hundred eleven".