43649261 has 2 divisors, whose sum is σ = 43649262. Its totient is φ = 43649260.

The previous prime is 43649231. The next prime is 43649269. The reversal of 43649261 is 16294634.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 43494025 + 155236 = 6595^2 + 394^2 .

It is a cyclic number.

It is not a de Polignac number, because 43649261 - 2¹⁰ = 43648237 is a prime.

It is a super-2 number, since 2×43649261² = 3810515971692242, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43649269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824630 + 21824631.

It is an arithmetic number, because the mean of its divisors is an integer number (21824631).

Almost surely, 2^43649261 is an apocalyptic number.

It is an amenable number.

43649261 is a deficient number, since it is larger than the sum of its proper divisors (1).

43649261 is an equidigital number, since it uses as much as digits as its factorization.

43649261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 31104, while the sum is 35.

The square root of 43649261 is about 6606.7587363245. The cubic root of 43649261 is about 352.0942762500.

The spelling of 43649261 in words is "forty-three million, six hundred forty-nine thousand, two hundred sixty-one".