213251273 has 2 divisors, whose sum is σ = 213251274. Its totient is φ = 213251272.

The previous prime is 213251261. The next prime is 213251287. The reversal of 213251273 is 372152312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 140114569 + 73136704 = 11837^2 + 8552^2 .

It is a cyclic number.

It is not a de Polignac number, because 213251273 - 2¹⁶ = 213185737 is a prime.

It is a super-2 number, since 2×213251273² = 90952210872241058, which contains 22 as substring.

It is equal to p_11771090 and since 213251273 and 11771090 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (213251873) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106625636 + 106625637.

It is an arithmetic number, because the mean of its divisors is an integer number (106625637).

Almost surely, 2^213251273 is an apocalyptic number.

It is an amenable number.

213251273 is a deficient number, since it is larger than the sum of its proper divisors (1).

213251273 is an equidigital number, since it uses as much as digits as its factorization.

213251273 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2520, while the sum is 26.

The square root of 213251273 is about 14603.1254531350. The cubic root of 213251273 is about 597.4440093890. Note that the first 3 decimals are identical.

The spelling of 213251273 in words is "two hundred thirteen million, two hundred fifty-one thousand, two hundred seventy-three".