1311051001 has 8 divisors (see below), whose sum is σ = 1412183304. Its totient is φ = 1209959040.

The previous prime is 1311050981. The next prime is 1311051017. The reversal of 1311051001 is 1001501131.

It can be written as a sum of positive squares in 4 ways, for example, as 584478976 + 726572025 = 24176^2 + 26955^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1311051001 - 2¹³ = 1311042809 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1311051031) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 114405 + ... + 125341.

It is an arithmetic number, because the mean of its divisors is an integer number (176522913).

Almost surely, 2^1311051001 is an apocalyptic number.

It is an amenable number.

1311051001 is a deficient number, since it is larger than the sum of its proper divisors (101132303).

1311051001 is a wasteful number, since it uses less digits than its factorization.

1311051001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20171.

The product of its (nonzero) digits is 15, while the sum is 13.

The square root of 1311051001 is about 36208.4382568484. The cubic root of 1311051001 is about 1094.4767211254.

Adding to 1311051001 its reverse (1001501131), we get a palindrome (2312552132).

The spelling of 1311051001 in words is "one billion, three hundred eleven million, fifty-one thousand, one".