1318931157 has 8 divisors (see below), whose sum is σ = 1758765184. Its totient is φ = 879192288.

The previous prime is 1318931153. The next prime is 1318931191. The reversal of 1318931157 is 7511398131.

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

It is not a de Polignac number, because 1318931157 - 2² = 1318931153 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1318931153) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 20148 + ... + 55170.

It is an arithmetic number, because the mean of its divisors is an integer number (219845648).

Almost surely, 2^1318931157 is an apocalyptic number.

It is an amenable number.

1318931157 is a deficient number, since it is larger than the sum of its proper divisors (439834027).

1318931157 is a wasteful number, since it uses less digits than its factorization.

1318931157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47579.

The product of its digits is 22680, while the sum is 39.

The square root of 1318931157 is about 36317.0918026210. The cubic root of 1318931157 is about 1096.6651498744.

The spelling of 1318931157 in words is "one billion, three hundred eighteen million, nine hundred thirty-one thousand, one hundred fifty-seven".