43649491 has 2 divisors, whose sum is σ = 43649492. Its totient is φ = 43649490.

The previous prime is 43649483. The next prime is 43649497. The reversal of 43649491 is 19494634.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43649491 - 2³ = 43649483 is a prime.

It is a super-3 number, since 3×43649491³ (a number of 24 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43649497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21824745 + 21824746.

It is an arithmetic number, because the mean of its divisors is an integer number (21824746).

Almost surely, 2^43649491 is an apocalyptic number.

43649491 is a deficient number, since it is larger than the sum of its proper divisors (1).

43649491 is an equidigital number, since it uses as much as digits as its factorization.

43649491 is an evil number, because the sum of its binary digits is even.

The product of its digits is 93312, while the sum is 40.

The square root of 43649491 is about 6606.7761427189. The cubic root of 43649491 is about 352.0948946762.

The spelling of 43649491 in words is "forty-three million, six hundred forty-nine thousand, four hundred ninety-one".