61633213 has 2 divisors, whose sum is σ = 61633214. Its totient is φ = 61633212.

The previous prime is 61633189. The next prime is 61633219. The reversal of 61633213 is 31233616.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 31843449 + 29789764 = 5643^2 + 5458^2 .

It is a cyclic number.

It is not a de Polignac number, because 61633213 - 2⁵ = 61633181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61633219) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30816606 + 30816607.

It is an arithmetic number, because the mean of its divisors is an integer number (30816607).

Almost surely, 2^61633213 is an apocalyptic number.

It is an amenable number.

61633213 is a deficient number, since it is larger than the sum of its proper divisors (1).

61633213 is an equidigital number, since it uses as much as digits as its factorization.

61633213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1944, while the sum is 25.

The square root of 61633213 is about 7850.6823270337. The cubic root of 61633213 is about 395.0071312070.

Adding to 61633213 its reverse (31233616), we get a palindrome (92866829).

The spelling of 61633213 in words is "sixty-one million, six hundred thirty-three thousand, two hundred thirteen".