1315775681 has 8 divisors (see below), whose sum is σ = 1456816224. Its totient is φ = 1178305920.

The previous prime is 1315775623. The next prime is 1315775711. The reversal of 1315775681 is 1865775131.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-1315775681 is a prime.

It is a super-2 number, since 2×1315775681² = 3462531285422027522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1315775381) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 891920 + ... + 893393.

It is an arithmetic number, because the mean of its divisors is an integer number (182102028).

Almost surely, 2^1315775681 is an apocalyptic number.

1315775681 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1315775681 is a deficient number, since it is larger than the sum of its proper divisors (141040543).

1315775681 is a wasteful number, since it uses less digits than its factorization.

1315775681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1785391.

The product of its digits is 176400, while the sum is 44.

The square root of 1315775681 is about 36273.6223859708. The cubic root of 1315775681 is about 1095.7898795449.

The spelling of 1315775681 in words is "one billion, three hundred fifteen million, seven hundred seventy-five thousand, six hundred eighty-one".