1131661240 has 16 divisors (see below), whose sum is σ = 2546237880. Its totient is φ = 452664480.

The previous prime is 1131661199. The next prime is 1131661277. The reversal of 1131661240 is 421661311.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14145726 + ... + 14145805.

Almost surely, 2^1131661240 is an apocalyptic number.

1131661240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1131661240 is an abundant number, since it is smaller than the sum of its proper divisors (1414576640).

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

1131661240 is a wasteful number, since it uses less digits than its factorization.

1131661240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28291542 (or 28291538 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 1131661240 is about 33640.1730078785. The cubic root of 1131661240 is about 1042.0906048144.

The spelling of 1131661240 in words is "one billion, one hundred thirty-one million, six hundred sixty-one thousand, two hundred forty".