213616973 has 2 divisors, whose sum is σ = 213616974. Its totient is φ = 213616972.

The previous prime is 213616957. The next prime is 213617003. The reversal of 213616973 is 379616312.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 118417924 + 95199049 = 10882^2 + 9757^2 .

It is a cyclic number.

It is not a de Polignac number, because 213616973 - 2⁴ = 213616957 is a prime.

It is a super-2 number, since 2×213616973² = 91264422307365458, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (213616933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106808486 + 106808487.

It is an arithmetic number, because the mean of its divisors is an integer number (106808487).

Almost surely, 2^213616973 is an apocalyptic number.

It is an amenable number.

213616973 is a deficient number, since it is larger than the sum of its proper divisors (1).

213616973 is an equidigital number, since it uses as much as digits as its factorization.

213616973 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 40824, while the sum is 38.

The square root of 213616973 is about 14615.6413817526. The cubic root of 213616973 is about 597.7853289633.

The spelling of 213616973 in words is "two hundred thirteen million, six hundred sixteen thousand, nine hundred seventy-three".