97543993 has 2 divisors, whose sum is σ = 97543994. Its totient is φ = 97543992.

The previous prime is 97543981. The next prime is 97543997. The reversal of 97543993 is 39934579.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 96884649 + 659344 = 9843^2 + 812^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97543993 is a prime.

It is not a weakly prime, because it can be changed into another prime (97543997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48771996 + 48771997.

It is an arithmetic number, because the mean of its divisors is an integer number (48771997).

Almost surely, 2^97543993 is an apocalyptic number.

It is an amenable number.

97543993 is a deficient number, since it is larger than the sum of its proper divisors (1).

97543993 is an equidigital number, since it uses as much as digits as its factorization.

97543993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 918540, while the sum is 49.

The square root of 97543993 is about 9876.4362499841. The cubic root of 97543993 is about 460.3274181242.

The spelling of 97543993 in words is "ninety-seven million, five hundred forty-three thousand, nine hundred ninety-three".