1611125081 has 16 divisors (see below), whose sum is σ = 1661310720. Its totient is φ = 1561887360.

The previous prime is 1611125063. The next prime is 1611125093. The reversal of 1611125081 is 1805211161.

It is a cyclic number.

It is not a de Polignac number, because 1611125081 - 2⁶ = 1611125017 is a prime.

It is a super-2 number, since 2×1611125081² = 5191448053254513122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1611125081.

It is not an unprimeable number, because it can be changed into a prime (1611125011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1615475 + ... + 1616471.

It is an arithmetic number, because the mean of its divisors is an integer number (103831920).

Almost surely, 2^1611125081 is an apocalyptic number.

It is an amenable number.

1611125081 is a deficient number, since it is larger than the sum of its proper divisors (50185639).

1611125081 is an equidigital number, since it uses as much as digits as its factorization.

1611125081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1424.

The product of its (nonzero) digits is 480, while the sum is 26.

The square root of 1611125081 is about 40138.8226160160. The cubic root of 1611125081 is about 1172.3116643380.

The spelling of 1611125081 in words is "one billion, six hundred eleven million, one hundred twenty-five thousand, eighty-one".