97820237 has 2 divisors, whose sum is σ = 97820238. Its totient is φ = 97820236.

The previous prime is 97820209. The next prime is 97820269. The reversal of 97820237 is 73202879.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94206436 + 3613801 = 9706^2 + 1901^2 .

It is an emirp because it is prime and its reverse (73202879) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-97820237 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 97820237.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (97820287) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48910118 + 48910119.

It is an arithmetic number, because the mean of its divisors is an integer number (48910119).

Almost surely, 2^97820237 is an apocalyptic number.

It is an amenable number.

97820237 is a deficient number, since it is larger than the sum of its proper divisors (1).

97820237 is an equidigital number, since it uses as much as digits as its factorization.

97820237 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 97820237 is about 9890.4113665712. The cubic root of 97820237 is about 460.7615567133.

The spelling of 97820237 in words is "ninety-seven million, eight hundred twenty thousand, two hundred thirty-seven".