1543120091 has 2 divisors, whose sum is σ = 1543120092. Its totient is φ = 1543120090.

The previous prime is 1543120087. The next prime is 1543120123. The reversal of 1543120091 is 1900213451.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1543120091 - 2² = 1543120087 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1543120091.

It is not a weakly prime, because it can be changed into another prime (1543120021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 771560045 + 771560046.

It is an arithmetic number, because the mean of its divisors is an integer number (771560046).

Almost surely, 2^1543120091 is an apocalyptic number.

1543120091 is a deficient number, since it is larger than the sum of its proper divisors (1).

1543120091 is an equidigital number, since it uses as much as digits as its factorization.

1543120091 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 1543120091 is about 39282.5672659005. The cubic root of 1543120091 is about 1155.5797121084.

The spelling of 1543120091 in words is "one billion, five hundred forty-three million, one hundred twenty thousand, ninety-one".