213169997 has 2 divisors, whose sum is σ = 213169998. Its totient is φ = 213169996.

The previous prime is 213169991. The next prime is 213170017. The reversal of 213169997 is 799961312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 207907561 + 5262436 = 14419^2 + 2294^2 .

It is a cyclic number.

It is not a de Polignac number, because 213169997 - 2¹⁶ = 213104461 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 (213169991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106584998 + 106584999.

It is an arithmetic number, because the mean of its divisors is an integer number (106584999).

Almost surely, 2^213169997 is an apocalyptic number.

It is an amenable number.

213169997 is a deficient number, since it is larger than the sum of its proper divisors (1).

213169997 is an equidigital number, since it uses as much as digits as its factorization.

213169997 is an evil number, because the sum of its binary digits is even.

The product of its digits is 183708, while the sum is 47.

The square root of 213169997 is about 14600.3423589997. The cubic root of 213169997 is about 597.3680988933.

It can be divided in two parts, 21316 and 9997, that added together give a palindrome (31313).

The spelling of 213169997 in words is "two hundred thirteen million, one hundred sixty-nine thousand, nine hundred ninety-seven".