213969997 has 2 divisors, whose sum is σ = 213969998. Its totient is φ = 213969996.

The previous prime is 213969953. The next prime is 213970027. The reversal of 213969997 is 799969312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 120538441 + 93431556 = 10979^2 + 9666^2 .

It is a cyclic number.

It is not a de Polignac number, because 213969997 - 2¹⁹ = 213445709 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213969097) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106984998 + 106984999.

It is an arithmetic number, because the mean of its divisors is an integer number (106984999).

Almost surely, 2^213969997 is an apocalyptic number.

It is an amenable number.

213969997 is a deficient number, since it is larger than the sum of its proper divisors (1).

213969997 is an equidigital number, since it uses as much as digits as its factorization.

213969997 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1653372, while the sum is 55.

The square root of 213969997 is about 14627.7133209535. The cubic root of 213969997 is about 598.1144482910.

The spelling of 213969997 in words is "two hundred thirteen million, nine hundred sixty-nine thousand, nine hundred ninety-seven".