61333621 has 2 divisors, whose sum is σ = 61333622. Its totient is φ = 61333620.

The previous prime is 61333619. The next prime is 61333669. The reversal of 61333621 is 12633316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 50211396 + 11122225 = 7086^2 + 3335^2 .

It is a cyclic number.

It is not a de Polignac number, because 61333621 - 2¹ = 61333619 is a prime.

Together with 61333619, 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 (61333681) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30666810 + 30666811.

It is an arithmetic number, because the mean of its divisors is an integer number (30666811).

Almost surely, 2^61333621 is an apocalyptic number.

It is an amenable number.

61333621 is a deficient number, since it is larger than the sum of its proper divisors (1).

61333621 is an equidigital number, since it uses as much as digits as its factorization.

61333621 is an odious number, because the sum of its binary digits is odd.

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

The square root of 61333621 is about 7831.5784488186. The cubic root of 61333621 is about 394.3660631990.

Adding to 61333621 its reverse (12633316), we get a palindrome (73966937).

The spelling of 61333621 in words is "sixty-one million, three hundred thirty-three thousand, six hundred twenty-one".