61647983 has 2 divisors, whose sum is σ = 61647984. Its totient is φ = 61647982.

The previous prime is 61647961. The next prime is 61648007. The reversal of 61647983 is 38974616.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 61647983 - 2⁶ = 61647919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (61647923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30823991 + 30823992.

It is an arithmetic number, because the mean of its divisors is an integer number (30823992).

Almost surely, 2^61647983 is an apocalyptic number.

61647983 is a deficient number, since it is larger than the sum of its proper divisors (1).

61647983 is an equidigital number, since it uses as much as digits as its factorization.

61647983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 44.

The square root of 61647983 is about 7851.6229532499. The cubic root of 61647983 is about 395.0386823197.

The spelling of 61647983 in words is "sixty-one million, six hundred forty-seven thousand, nine hundred eighty-three".