61567813 has 2 divisors, whose sum is σ = 61567814. Its totient is φ = 61567812.

The previous prime is 61567811. The next prime is 61567817. The reversal of 61567813 is 31876516.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58262689 + 3305124 = 7633^2 + 1818^2 .

It is a cyclic number.

It is not a de Polignac number, because 61567813 - 2¹ = 61567811 is a prime.

Together with 61567811, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61567811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30783906 + 30783907.

It is an arithmetic number, because the mean of its divisors is an integer number (30783907).

Almost surely, 2^61567813 is an apocalyptic number.

It is an amenable number.

61567813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61567813 is an equidigital number, since it uses as much as digits as its factorization.

61567813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30240, while the sum is 37.

The square root of 61567813 is about 7846.5159784455. The cubic root of 61567813 is about 394.8673656058.

The spelling of 61567813 in words is "sixty-one million, five hundred sixty-seven thousand, eight hundred thirteen".