97783991 has 2 divisors, whose sum is σ = 97783992. Its totient is φ = 97783990.

The previous prime is 97783981. The next prime is 97783997. The reversal of 97783991 is 19938779.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 97783991 - 2⁶ = 97783927 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97783997) 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, 48891995 + 48891996.

It is an arithmetic number, because the mean of its divisors is an integer number (48891996).

Almost surely, 2^97783991 is an apocalyptic number.

97783991 is a deficient number, since it is larger than the sum of its proper divisors (1).

97783991 is an equidigital number, since it uses as much as digits as its factorization.

97783991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 857304, while the sum is 53.

The square root of 97783991 is about 9888.5788159877. The cubic root of 97783991 is about 460.7046399748.

The spelling of 97783991 in words is "ninety-seven million, seven hundred eighty-three thousand, nine hundred ninety-one".