97820461 has 2 divisors, whose sum is σ = 97820462. Its totient is φ = 97820460.

The previous prime is 97820453. The next prime is 97820477. The reversal of 97820461 is 16402879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93896100 + 3924361 = 9690^2 + 1981^2 .

It is an emirp because it is prime and its reverse (16402879) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 97820461 - 2³ = 97820453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97820461.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97820561) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48910230 + 48910231.

It is an arithmetic number, because the mean of its divisors is an integer number (48910231).

Almost surely, 2^97820461 is an apocalyptic number.

It is an amenable number.

97820461 is a deficient number, since it is larger than the sum of its proper divisors (1).

97820461 is an equidigital number, since it uses as much as digits as its factorization.

97820461 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 97820461 is about 9890.4226906639. The cubic root of 97820461 is about 460.7619084146.

The spelling of 97820461 in words is "ninety-seven million, eight hundred twenty thousand, four hundred sixty-one".