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213533681 is a prime number
BaseRepresentation
bin11001011101001…
…00001111110001
3112212210122010212
430232210033301
5414131034211
633104433505
75202002114
oct1456441761
9485718125
10213533681
11aa597019
125b618895
13353153ba
142050657b
1513b2e38b
hexcba43f1

213533681 has 2 divisors, whose sum is σ = 213533682. Its totient is φ = 213533680.

The previous prime is 213533669. The next prime is 213533689. The reversal of 213533681 is 186335312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 211993600 + 1540081 = 14560^2 + 1241^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-213533681 is a prime.

It is a super-2 number, since 2×2135336812 = 91193265842819522, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (213533689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 106766840 + 106766841.

It is an arithmetic number, because the mean of its divisors is an integer number (106766841).

Almost surely, 2213533681 is an apocalyptic number.

It is an amenable number.

213533681 is a deficient number, since it is larger than the sum of its proper divisors (1).

213533681 is an equidigital number, since it uses as much as digits as its factorization.

213533681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12960, while the sum is 32.

The square root of 213533681 is about 14612.7916908440. The cubic root of 213533681 is about 597.7076241386.

Adding to 213533681 its reverse (186335312), we get a palindrome (399868993).

The spelling of 213533681 in words is "two hundred thirteen million, five hundred thirty-three thousand, six hundred eighty-one".