1611056543 has 4 divisors (see below), whose sum is σ = 1637467368. Its totient is φ = 1584645720.

The previous prime is 1611056539. The next prime is 1611056549. The reversal of 1611056543 is 3456501161.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1611056543 - 2² = 1611056539 is a prime.

It is a super-2 number, since 2×1611056543² = 5191006369486221698, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1611056549) 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, 13205321 + ... + 13205442.

It is an arithmetic number, because the mean of its divisors is an integer number (409366842).

Almost surely, 2^1611056543 is an apocalyptic number.

1611056543 is a deficient number, since it is larger than the sum of its proper divisors (26410825).

1611056543 is an equidigital number, since it uses as much as digits as its factorization.

1611056543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26410824.

The product of its (nonzero) digits is 10800, while the sum is 32.

The square root of 1611056543 is about 40137.9688449727. The cubic root of 1611056543 is about 1172.2950405436.

The spelling of 1611056543 in words is "one billion, six hundred eleven million, fifty-six thousand, five hundred forty-three".