61821983 has 2 divisors, whose sum is σ = 61821984. Its totient is φ = 61821982.

The previous prime is 61821941. The next prime is 61822001. The reversal of 61821983 is 38912816.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 61821983 - 2¹⁶ = 61756447 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61821923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30910991 + 30910992.

It is an arithmetic number, because the mean of its divisors is an integer number (30910992).

Almost surely, 2^61821983 is an apocalyptic number.

61821983 is a deficient number, since it is larger than the sum of its proper divisors (1).

61821983 is an equidigital number, since it uses as much as digits as its factorization.

61821983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20736, while the sum is 38.

The square root of 61821983 is about 7862.6956573430. The cubic root of 61821983 is about 395.4099956989.

The spelling of 61821983 in words is "sixty-one million, eight hundred twenty-one thousand, nine hundred eighty-three".