61996813 has 2 divisors, whose sum is σ = 61996814. Its totient is φ = 61996812.

The previous prime is 61996789. The next prime is 61996817. The reversal of 61996813 is 31869916.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 61496964 + 499849 = 7842^2 + 707^2 .

It is a cyclic number.

It is not a de Polignac number, because 61996813 - 2²¹ = 59899661 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61996813.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61996817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30998406 + 30998407.

It is an arithmetic number, because the mean of its divisors is an integer number (30998407).

Almost surely, 2^61996813 is an apocalyptic number.

It is an amenable number.

61996813 is a deficient number, since it is larger than the sum of its proper divisors (1).

61996813 is an equidigital number, since it uses as much as digits as its factorization.

61996813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69984, while the sum is 43.

The square root of 61996813 is about 7873.8054967087. The cubic root of 61996813 is about 395.7823792386.

The spelling of 61996813 in words is "sixty-one million, nine hundred ninety-six thousand, eight hundred thirteen".