1317918551 has 4 divisors (see below), whose sum is σ = 1319017104. Its totient is φ = 1316820000.

The previous prime is 1317918541. The next prime is 1317918629. The reversal of 1317918551 is 1558197131.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1317918551 - 2¹⁴ = 1317902167 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1317918499 and 1317918508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1317918521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 547475 + ... + 549876.

It is an arithmetic number, because the mean of its divisors is an integer number (329754276).

Almost surely, 2^1317918551 is an apocalyptic number.

1317918551 is a deficient number, since it is larger than the sum of its proper divisors (1098553).

1317918551 is a wasteful number, since it uses less digits than its factorization.

1317918551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1098552.

The product of its digits is 37800, while the sum is 41.

The square root of 1317918551 is about 36303.1479489038. The cubic root of 1317918551 is about 1096.3844240715.

The spelling of 1317918551 in words is "one billion, three hundred seventeen million, nine hundred eighteen thousand, five hundred fifty-one".