1311202000 has 40 divisors (see below), whose sum is σ = 3170491272. Its totient is φ = 524480000.

The previous prime is 1311201973. The next prime is 1311202001. The reversal of 1311202000 is 2021131.

It can be written as a sum of positive squares in 4 ways, for example, as 246615616 + 1064586384 = 15704^2 + 32628^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311202001) 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, 325801 + ... + 329800.

Almost surely, 2^1311202000 is an apocalyptic number.

1311202000 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311202000 is an abundant number, since it is smaller than the sum of its proper divisors (1859289272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1311202000 is an equidigital number, since it uses as much as digits as its factorization.

1311202000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655624 (or 655608 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 10.

The square root of 1311202000 is about 36210.5233323132. The cubic root of 1311202000 is about 1094.5187379363.

Adding to 1311202000 its reverse (2021131), we get a palindrome (1313223131).

The spelling of 1311202000 in words is "one billion, three hundred eleven million, two hundred two thousand".