213669997 has 2 divisors, whose sum is σ = 213669998. Its totient is φ = 213669996.

The previous prime is 213669959. The next prime is 213670013. The reversal of 213669997 is 799966312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 140635881 + 73034116 = 11859^2 + 8546^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213669997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213669917) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106834998 + 106834999.

It is an arithmetic number, because the mean of its divisors is an integer number (106834999).

Almost surely, 2^213669997 is an apocalyptic number.

It is an amenable number.

213669997 is a deficient number, since it is larger than the sum of its proper divisors (1).

213669997 is an equidigital number, since it uses as much as digits as its factorization.

213669997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1102248, while the sum is 52.

The square root of 213669997 is about 14617.4552162817. The cubic root of 213669997 is about 597.8347856249.

The spelling of 213669997 in words is "two hundred thirteen million, six hundred sixty-nine thousand, nine hundred ninety-seven".