1318771690 has 8 divisors (see below), whose sum is σ = 2373789060. Its totient is φ = 527508672.

The previous prime is 1318771673. The next prime is 1318771691. The reversal of 1318771690 is 961778131.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1199721769 + 119049921 = 34637^2 + 10911^2 .

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

It is a super-2 number, since 2×1318771690² = 3478317540690912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1318771691) 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, 65938575 + ... + 65938594.

Almost surely, 2^1318771690 is an apocalyptic number.

1318771690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1318771690 is a deficient number, since it is larger than the sum of its proper divisors (1055017370).

1318771690 is a wasteful number, since it uses less digits than its factorization.

1318771690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131877176.

The product of its (nonzero) digits is 63504, while the sum is 43.

The square root of 1318771690 is about 36314.8962548429. The cubic root of 1318771690 is about 1096.6209502083.

The spelling of 1318771690 in words is "one billion, three hundred eighteen million, seven hundred seventy-one thousand, six hundred ninety".