1261317160 has 32 divisors (see below), whose sum is σ = 2873894400. Its totient is φ = 498139200.

The previous prime is 1261317157. The next prime is 1261317173. The reversal of 1261317160 is 617131621.

It is a super-2 number, since 2×1261317160² = 3181841956220931200, which contains 22 as substring.

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, 196416 + ... + 202735.

It is an arithmetic number, because the mean of its divisors is an integer number (89809200).

Almost surely, 2^1261317160 is an apocalyptic number.

1261317160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1261317160 is an abundant number, since it is smaller than the sum of its proper divisors (1612577240).

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

1261317160 is a wasteful number, since it uses less digits than its factorization.

1261317160 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 399241 (or 399237 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 1261317160 is about 35515.0272420000. The cubic root of 1261317160 is about 1080.4585272926.

Adding to 1261317160 its reverse (617131621), we get a palindrome (1878448781).

The spelling of 1261317160 in words is "one billion, two hundred sixty-one million, three hundred seventeen thousand, one hundred sixty".