65987197 has 2 divisors, whose sum is σ = 65987198. Its totient is φ = 65987196.

The previous prime is 65987191. The next prime is 65987249. The reversal of 65987197 is 79178956.

It is a happy number.

It is an a-pointer prime, because the next prime (65987249) can be obtained adding 65987197 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34503876 + 31483321 = 5874^2 + 5611^2 .

It is a cyclic number.

It is not a de Polignac number, because 65987197 - 2¹⁹ = 65462909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (65987191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32993598 + 32993599.

It is an arithmetic number, because the mean of its divisors is an integer number (32993599).

Almost surely, 2^65987197 is an apocalyptic number.

It is an amenable number.

65987197 is a deficient number, since it is larger than the sum of its proper divisors (1).

65987197 is an equidigital number, since it uses as much as digits as its factorization.

65987197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 952560, while the sum is 52.

The square root of 65987197 is about 8123.2503962392. The cubic root of 65987197 is about 404.0978690612.

The spelling of 65987197 in words is "sixty-five million, nine hundred eighty-seven thousand, one hundred ninety-seven".