1040543891 has 2 divisors, whose sum is σ = 1040543892. Its totient is φ = 1040543890.

The previous prime is 1040543887. The next prime is 1040543899. The reversal of 1040543891 is 1983450401.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1040543891 - 2² = 1040543887 is a prime.

It is not a weakly prime, because it can be changed into another prime (1040543899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 520271945 + 520271946.

It is an arithmetic number, because the mean of its divisors is an integer number (520271946).

Almost surely, 2^1040543891 is an apocalyptic number.

1040543891 is a deficient number, since it is larger than the sum of its proper divisors (1).

1040543891 is an equidigital number, since it uses as much as digits as its factorization.

1040543891 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 1040543891 is about 32257.4625629481. The cubic root of 1040543891 is about 1013.3359910792.

The spelling of 1040543891 in words is "one billion, forty million, five hundred forty-three thousand, eight hundred ninety-one".