97721543 has 2 divisors, whose sum is σ = 97721544. Its totient is φ = 97721542.

The previous prime is 97721531. The next prime is 97721557. The reversal of 97721543 is 34512779.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 97721543 - 2⁴ = 97721527 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 97721497 and 97721506.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97726543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48860771 + 48860772.

It is an arithmetic number, because the mean of its divisors is an integer number (48860772).

Almost surely, 2^97721543 is an apocalyptic number.

97721543 is a deficient number, since it is larger than the sum of its proper divisors (1).

97721543 is an equidigital number, since it uses as much as digits as its factorization.

97721543 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 52920, while the sum is 38.

The square root of 97721543 is about 9885.4207295390. The cubic root of 97721543 is about 460.6065454921.

The spelling of 97721543 in words is "ninety-seven million, seven hundred twenty-one thousand, five hundred forty-three".