1311499881 has 12 divisors (see below), whose sum is σ = 1911769860. Its totient is φ = 866311200.

The previous prime is 1311499879. The next prime is 1311499883. The reversal of 1311499881 is 1889941131.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (1311499879) and next prime (1311499883).

It can be written as a sum of positive squares in 2 ways, for example, as 1124931600 + 186568281 = 33540^2 + 13659^2 .

It is not a de Polignac number, because 1311499881 - 2¹ = 1311499879 is a prime.

It is a super-2 number, since 2×1311499881² = 3440063875726028322, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1311499883) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 667470 + ... + 669431.

It is an arithmetic number, because the mean of its divisors is an integer number (159314155).

Almost surely, 2^1311499881 is an apocalyptic number.

It is an amenable number.

1311499881 is a deficient number, since it is larger than the sum of its proper divisors (600269979).

1311499881 is a wasteful number, since it uses less digits than its factorization.

1311499881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1337016 (or 1337013 counting only the distinct ones).

The product of its digits is 62208, while the sum is 45.

The square root of 1311499881 is about 36214.6362814816. The cubic root of 1311499881 is about 1094.6016165086.

The spelling of 1311499881 in words is "one billion, three hundred eleven million, four hundred ninety-nine thousand, eight hundred eighty-one".