1231317560 has 32 divisors (see below), whose sum is σ = 3022326000. Its totient is φ = 447751680.

The previous prime is 1231317539. The next prime is 1231317611. The reversal of 1231317560 is 657131321.

It is a super-2 number, since 2×1231317560² = 3032285867128707200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1398785 + ... + 1399664.

Almost surely, 2^1231317560 is an apocalyptic number.

1231317560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1231317560 is an abundant number, since it is smaller than the sum of its proper divisors (1791008440).

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

1231317560 is a wasteful number, since it uses less digits than its factorization.

1231317560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2798471 (or 2798467 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 29.

The square root of 1231317560 is about 35090.1347959793. The cubic root of 1231317560 is about 1071.8237044871.

Adding to 1231317560 its reverse (657131321), we get a palindrome (1888448881).

The spelling of 1231317560 in words is "one billion, two hundred thirty-one million, three hundred seventeen thousand, five hundred sixty".