61888921 has 2 divisors, whose sum is σ = 61888922. Its totient is φ = 61888920.

The previous prime is 61888919. The next prime is 61888933. The reversal of 61888921 is 12988816.

61888921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 38502025 + 23386896 = 6205^2 + 4836^2 .

It is a cyclic number.

It is not a de Polignac number, because 61888921 - 2¹ = 61888919 is a prime.

Together with 61888919, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (61888951) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30944460 + 30944461.

It is an arithmetic number, because the mean of its divisors is an integer number (30944461).

Almost surely, 2^61888921 is an apocalyptic number.

It is an amenable number.

61888921 is a deficient number, since it is larger than the sum of its proper divisors (1).

61888921 is an equidigital number, since it uses as much as digits as its factorization.

61888921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 55296, while the sum is 43.

The square root of 61888921 is about 7866.9511883575. The cubic root of 61888921 is about 395.5526548092.

The spelling of 61888921 in words is "sixty-one million, eight hundred eighty-eight thousand, nine hundred twenty-one".