1310121999 has 32 divisors (see below), whose sum is σ = 1987372800. Its totient is φ = 852677280.

The previous prime is 1310121977. The next prime is 1310122019. The reversal of 1310121999 is 9991210131.

It is not a de Polignac number, because 1310121999 - 2¹³ = 1310113807 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1310121959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 299772 + ... + 304110.

It is an arithmetic number, because the mean of its divisors is an integer number (62105400).

Almost surely, 2^1310121999 is an apocalyptic number.

1310121999 is a deficient number, since it is larger than the sum of its proper divisors (677250801).

1310121999 is a wasteful number, since it uses less digits than its factorization.

1310121999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4612 (or 4606 counting only the distinct ones).

The product of its (nonzero) digits is 4374, while the sum is 36.

The square root of 1310121999 is about 36195.6074544965. The cubic root of 1310121999 is about 1094.2181470715.

The spelling of 1310121999 in words is "one billion, three hundred ten million, one hundred twenty-one thousand, nine hundred ninety-nine".