61361921 has 2 divisors, whose sum is σ = 61361922. Its totient is φ = 61361920.

The previous prime is 61361917. The next prime is 61361939. The reversal of 61361921 is 12916316.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58675600 + 2686321 = 7660^2 + 1639^2 .

It is a cyclic number.

It is not a de Polignac number, because 61361921 - 2² = 61361917 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (61364921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30680960 + 30680961.

It is an arithmetic number, because the mean of its divisors is an integer number (30680961).

Almost surely, 2^61361921 is an apocalyptic number.

It is an amenable number.

61361921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61361921 is an equidigital number, since it uses as much as digits as its factorization.

61361921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1944, while the sum is 29.

The square root of 61361921 is about 7833.3850281982. The cubic root of 61361921 is about 394.4267088031.

The spelling of 61361921 in words is "sixty-one million, three hundred sixty-one thousand, nine hundred twenty-one".