1611124681 has 4 divisors (see below), whose sum is σ = 1612837764. Its totient is φ = 1609411600.

The previous prime is 1611124639. The next prime is 1611124729. The reversal of 1611124681 is 1864211161.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1864211161 = 937 ⋅1989553.

It can be written as a sum of positive squares in 2 ways, for example, as 562401225 + 1048723456 = 23715^2 + 32384^2 .

It is a cyclic number.

It is not a de Polignac number, because 1611124681 - 2¹⁵ = 1611091913 is a prime.

It is a super-2 number, since 2×1611124681² = 5191445475454703522, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) 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 not an unprimeable number, because it can be changed into a prime (1611124601) 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, 855130 + ... + 857011.

It is an arithmetic number, because the mean of its divisors is an integer number (403209441).

Almost surely, 2^1611124681 is an apocalyptic number.

It is an amenable number.

1611124681 is a deficient number, since it is larger than the sum of its proper divisors (1713083).

1611124681 is an equidigital number, since it uses as much as digits as its factorization.

1611124681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1713082.

The product of its digits is 2304, while the sum is 31.

The square root of 1611124681 is about 40138.8176333085. The cubic root of 1611124681 is about 1172.3115673200.

The spelling of 1611124681 in words is "one billion, six hundred eleven million, one hundred twenty-four thousand, six hundred eighty-one".