43640951 has 2 divisors, whose sum is σ = 43640952. Its totient is φ = 43640950.

The previous prime is 43640917. The next prime is 43640953. The reversal of 43640951 is 15904634.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43640951 - 2¹⁰ = 43639927 is a prime.

It is a Sophie Germain prime.

Together with 43640953, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43640953) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21820475 + 21820476.

It is an arithmetic number, because the mean of its divisors is an integer number (21820476).

Almost surely, 2^43640951 is an apocalyptic number.

43640951 is a deficient number, since it is larger than the sum of its proper divisors (1).

43640951 is an equidigital number, since it uses as much as digits as its factorization.

43640951 is an odious number, because the sum of its binary digits is odd.

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

The square root of 43640951 is about 6606.1298049614. The cubic root of 43640951 is about 352.0719307847.

The spelling of 43640951 in words is "forty-three million, six hundred forty thousand, nine hundred fifty-one".