1056591643 has 4 divisors (see below), whose sum is σ = 1056665448. Its totient is φ = 1056517840.

The previous prime is 1056591637. The next prime is 1056591677. The reversal of 1056591643 is 3461956501.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 3461956501 = 1759 ⋅1968139.

It is a cyclic number.

It is not a de Polignac number, because 1056591643 - 2⁵ = 1056591611 is a prime.

It is a super-2 number, since 2×1056591643² = 2232771800114878898, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1056591596 and 1056591605.

It is not an unprimeable number, because it can be changed into a prime (1056591143) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7753 + ... + 46618.

It is an arithmetic number, because the mean of its divisors is an integer number (264166362).

Almost surely, 2^1056591643 is an apocalyptic number.

1056591643 is a deficient number, since it is larger than the sum of its proper divisors (73805).

1056591643 is an equidigital number, since it uses as much as digits as its factorization.

1056591643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73804.

The product of its (nonzero) digits is 97200, while the sum is 40.

The square root of 1056591643 is about 32505.2556212069. The cubic root of 1056591643 is about 1018.5188174131.

The spelling of 1056591643 in words is "one billion, fifty-six million, five hundred ninety-one thousand, six hundred forty-three".