1311251140 has 48 divisors (see below), whose sum is σ = 2994434352. Its totient is φ = 480301056.

The previous prime is 1311251131. The next prime is 1311251197. The reversal of 1311251140 is 411521131.

It can be written as a sum of positive squares in 8 ways, for example, as 234886276 + 1076364864 = 15326^2 + 32808^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39537 + ... + 64696.

It is an arithmetic number, because the mean of its divisors is an integer number (62384049).

Almost surely, 2^1311251140 is an apocalyptic number.

1311251140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311251140 is an abundant number, since it is smaller than the sum of its proper divisors (1683183212).

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

1311251140 is a wasteful number, since it uses less digits than its factorization.

1311251140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104296 (or 104294 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

The square root of 1311251140 is about 36211.2018579886. The cubic root of 1311251140 is about 1094.5324108814.

Adding to 1311251140 its reverse (411521131), we get a palindrome (1722772271).

The spelling of 1311251140 in words is "one billion, three hundred eleven million, two hundred fifty-one thousand, one hundred forty".