1056005591 has 2 divisors, whose sum is σ = 1056005592. Its totient is φ = 1056005590.

The previous prime is 1056005563. The next prime is 1056005683. The reversal of 1056005591 is 1955006501.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1056005591 - 2⁶ = 1056005527 is a prime.

It is a super-2 number, since 2×1056005591² = 2230295616446518562, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1056005521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 528002795 + 528002796.

It is an arithmetic number, because the mean of its divisors is an integer number (528002796).

Almost surely, 2^1056005591 is an apocalyptic number.

1056005591 is a deficient number, since it is larger than the sum of its proper divisors (1).

1056005591 is an equidigital number, since it uses as much as digits as its factorization.

1056005591 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 32.

The square root of 1056005591 is about 32496.2396439957. The cubic root of 1056005591 is about 1018.3304711117.

The spelling of 1056005591 in words is "one billion, fifty-six million, five thousand, five hundred ninety-one".