1311610081 has 4 divisors (see below), whose sum is σ = 1311700500. Its totient is φ = 1311519664.

The previous prime is 1311610063. The next prime is 1311610099. The reversal of 1311610081 is 1800161131.

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.

It is an interprime number because it is at equal distance from previous prime (1311610063) and next prime (1311610099).

It can be written as a sum of positive squares in 2 ways, for example, as 398361681 + 913248400 = 19959^2 + 30220^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311610081 - 2⁷ = 1311609953 is a prime.

It is a super-2 number, since 2×1311610081² = 3440642009161653122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311610021) 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, 17986 + ... + 54283.

It is an arithmetic number, because the mean of its divisors is an integer number (327925125).

Almost surely, 2^1311610081 is an apocalyptic number.

It is an amenable number.

1311610081 is a deficient number, since it is larger than the sum of its proper divisors (90419).

1311610081 is an equidigital number, since it uses as much as digits as its factorization.

1311610081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90418.

The product of its (nonzero) digits is 144, while the sum is 22.

The square root of 1311610081 is about 36216.1577338072. The cubic root of 1311610081 is about 1094.6322739570.

The spelling of 1311610081 in words is "one billion, three hundred eleven million, six hundred ten thousand, eighty-one".