43485991 has 2 divisors, whose sum is σ = 43485992. Its totient is φ = 43485990.

The previous prime is 43485979. The next prime is 43485997. The reversal of 43485991 is 19958434.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 43485991 - 2¹³ = 43477799 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (43485997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21742995 + 21742996.

It is an arithmetic number, because the mean of its divisors is an integer number (21742996).

Almost surely, 2^43485991 is an apocalyptic number.

43485991 is a deficient number, since it is larger than the sum of its proper divisors (1).

43485991 is an equidigital number, since it uses as much as digits as its factorization.

43485991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The square root of 43485991 is about 6594.3908740687. The cubic root of 43485991 is about 351.6547250299.

The spelling of 43485991 in words is "forty-three million, four hundred eighty-five thousand, nine hundred ninety-one".