43491269 has 2 divisors, whose sum is σ = 43491270. Its totient is φ = 43491268.

The previous prime is 43491221. The next prime is 43491281. The reversal of 43491269 is 96219434.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26368225 + 17123044 = 5135^2 + 4138^2 .

It is a cyclic number.

It is not a de Polignac number, because 43491269 - 2⁸ = 43491013 is a prime.

It is a super-2 number, since 2×43491269² = 3782980958460722, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43491289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21745634 + 21745635.

It is an arithmetic number, because the mean of its divisors is an integer number (21745635).

Almost surely, 2^43491269 is an apocalyptic number.

It is an amenable number.

43491269 is a deficient number, since it is larger than the sum of its proper divisors (1).

43491269 is an equidigital number, since it uses as much as digits as its factorization.

43491269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The square root of 43491269 is about 6594.7910505186. The cubic root of 43491269 is about 351.6689515161.

The spelling of 43491269 in words is "forty-three million, four hundred ninety-one thousand, two hundred sixty-nine".