1011005591 has 2 divisors, whose sum is σ = 1011005592. Its totient is φ = 1011005590.

The previous prime is 1011005587. The next prime is 1011005621. The reversal of 1011005591 is 1955001101.

1011005591 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1011005591 - 2² = 1011005587 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1011005531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505502795 + 505502796.

It is an arithmetic number, because the mean of its divisors is an integer number (505502796).

Almost surely, 2^1011005591 is an apocalyptic number.

1011005591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011005591 is an equidigital number, since it uses as much as digits as its factorization.

1011005591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 225, while the sum is 23.

The square root of 1011005591 is about 31796.3141102864. The cubic root of 1011005591 is about 1003.6551539055.

Adding to 1011005591 its reverse (1955001101), we get a palindrome (2966006692).

The spelling of 1011005591 in words is "one billion, eleven million, five thousand, five hundred ninety-one".