1331151640 has 192 divisors, whose sum is σ = 3800714400. Its totient is φ = 415844352.

The previous prime is 1331151637. The next prime is 1331151641. The reversal of 1331151640 is 461511331.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331151641) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 2267427 + ... + 2268013.

Almost surely, 2^1331151640 is an apocalyptic number.

1331151640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1331151640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1900357200).

1331151640 is an abundant number, since it is smaller than the sum of its proper divisors (2469562760).

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

1331151640 is a wasteful number, since it uses less digits than its factorization.

1331151640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 1331151640 is about 36484.9508701876. The cubic root of 1331151640 is about 1100.0417725184.

Adding to 1331151640 its reverse (461511331), we get a palindrome (1792662971).

The spelling of 1331151640 in words is "one billion, three hundred thirty-one million, one hundred fifty-one thousand, six hundred forty".