43261987 has 2 divisors, whose sum is σ = 43261988. Its totient is φ = 43261986.

The previous prime is 43261979. The next prime is 43262017. The reversal of 43261987 is 78916234.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 43261987 - 2³ = 43261979 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (43261087) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21630993 + 21630994.

It is an arithmetic number, because the mean of its divisors is an integer number (21630994).

Almost surely, 2^43261987 is an apocalyptic number.

43261987 is a deficient number, since it is larger than the sum of its proper divisors (1).

43261987 is an equidigital number, since it uses as much as digits as its factorization.

43261987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 72576, while the sum is 40.

The square root of 43261987 is about 6577.3845105787. The cubic root of 43261987 is about 351.0498734607.

The spelling of 43261987 in words is "forty-three million, two hundred sixty-one thousand, nine hundred eighty-seven".