61821923 has 2 divisors, whose sum is σ = 61821924. Its totient is φ = 61821922.

The previous prime is 61821889. The next prime is 61821941. The reversal of 61821923 is 32912816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61821923 - 2⁸ = 61821667 is a prime.

It is a Sophie Germain prime.

It is a self number, because there is not a number n which added to its sum of digits gives 61821923.

It is not a weakly prime, because it can be changed into another prime (61821983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910961 + 30910962.

It is an arithmetic number, because the mean of its divisors is an integer number (30910962).

Almost surely, 2^61821923 is an apocalyptic number.

61821923 is a deficient number, since it is larger than the sum of its proper divisors (1).

61821923 is an equidigital number, since it uses as much as digits as its factorization.

61821923 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 61821923 is about 7862.6918418567. The cubic root of 61821923 is about 395.4098677800.

The spelling of 61821923 in words is "sixty-one million, eight hundred twenty-one thousand, nine hundred twenty-three".