1331131240 has 32 divisors (see below), whose sum is σ = 3075995880. Its totient is φ = 518061312.

The previous prime is 1331131231. The next prime is 1331131261. The reversal of 1331131240 is 421311331.

It can be written as a sum of positive squares in 4 ways, for example, as 1161037476 + 170093764 = 34074^2 + 13042^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 448227 + ... + 451186.

Almost surely, 2^1331131240 is an apocalyptic number.

1331131240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1331131240 is an abundant number, since it is smaller than the sum of its proper divisors (1744864640).

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

1331131240 is a wasteful number, since it uses less digits than its factorization.

1331131240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 899461 (or 899457 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 1331131240 is about 36484.6713017947. The cubic root of 1331131240 is about 1100.0361530817.

Adding to 1331131240 its reverse (421311331), we get a palindrome (1752442571).

It can be divided in two parts, 13311 and 31240, that added together give a triangular number (44551 = T₂₉₈).

The spelling of 1331131240 in words is "one billion, three hundred thirty-one million, one hundred thirty-one thousand, two hundred forty".