97755821 has 2 divisors, whose sum is σ = 97755822. Its totient is φ = 97755820.

The previous prime is 97755787. The next prime is 97755863. The reversal of 97755821 is 12855779.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 86229796 + 11526025 = 9286^2 + 3395^2 .

It is a cyclic number.

It is not a de Polignac number, because 97755821 - 2¹⁴ = 97739437 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97755871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48877910 + 48877911.

It is an arithmetic number, because the mean of its divisors is an integer number (48877911).

Almost surely, 2^97755821 is an apocalyptic number.

It is an amenable number.

97755821 is a deficient number, since it is larger than the sum of its proper divisors (1).

97755821 is an equidigital number, since it uses as much as digits as its factorization.

97755821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 176400, while the sum is 44.

The square root of 97755821 is about 9887.1543428835. The cubic root of 97755821 is about 460.6603951857.

The spelling of 97755821 in words is "ninety-seven million, seven hundred fifty-five thousand, eight hundred twenty-one".