61620241 has 2 divisors, whose sum is σ = 61620242. Its totient is φ = 61620240.

The previous prime is 61620239. The next prime is 61620263. The reversal of 61620241 is 14202616.

It is an a-pointer prime, because the next prime (61620263) can be obtained adding 61620241 to its sum of digits (22).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31315216 + 30305025 = 5596^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 61620241 - 2¹ = 61620239 is a prime.

Together with 61620239, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61620341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30810120 + 30810121.

It is an arithmetic number, because the mean of its divisors is an integer number (30810121).

Almost surely, 2^61620241 is an apocalyptic number.

It is an amenable number.

61620241 is a deficient number, since it is larger than the sum of its proper divisors (1).

61620241 is an equidigital number, since it uses as much as digits as its factorization.

61620241 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 61620241 is about 7849.8561133310. The cubic root of 61620241 is about 394.9794167558.

Adding to 61620241 its reverse (14202616), we get a palindrome (75822857).

The spelling of 61620241 in words is "sixty-one million, six hundred twenty thousand, two hundred forty-one".