97641821 has 2 divisors, whose sum is σ = 97641822. Its totient is φ = 97641820.

The previous prime is 97641809. The next prime is 97641833. The reversal of 97641821 is 12814679.

It is a balanced prime because it is at equal distance from previous prime (97641809) and next prime (97641833).

It can be written as a sum of positive squares in only one way, i.e., 74736025 + 22905796 = 8645^2 + 4786^2 .

It is an emirp because it is prime and its reverse (12814679) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97641821 - 2²² = 93447517 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 (97641721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48820910 + 48820911.

It is an arithmetic number, because the mean of its divisors is an integer number (48820911).

Almost surely, 2^97641821 is an apocalyptic number.

It is an amenable number.

97641821 is a deficient number, since it is larger than the sum of its proper divisors (1).

97641821 is an equidigital number, since it uses as much as digits as its factorization.

97641821 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 97641821 is about 9881.3876049875. The cubic root of 97641821 is about 460.4812559397.

The spelling of 97641821 in words is "ninety-seven million, six hundred forty-one thousand, eight hundred twenty-one".