61444813 has 2 divisors, whose sum is σ = 61444814. Its totient is φ = 61444812.

The previous prime is 61444787. The next prime is 61444819. The reversal of 61444813 is 31844416.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61418569 + 26244 = 7837^2 + 162^2 .

It is a cyclic number.

It is not a de Polignac number, because 61444813 - 2⁵ = 61444781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61444819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30722406 + 30722407.

It is an arithmetic number, because the mean of its divisors is an integer number (30722407).

Almost surely, 2^61444813 is an apocalyptic number.

It is an amenable number.

61444813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61444813 is an equidigital number, since it uses as much as digits as its factorization.

61444813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9216, while the sum is 31.

The square root of 61444813 is about 7838.6741863660. The cubic root of 61444813 is about 394.6042353380.

The spelling of 61444813 in words is "sixty-one million, four hundred forty-four thousand, eight hundred thirteen".