1168531638 has 8 divisors (see below), whose sum is σ = 2337063288. Its totient is φ = 389510544.

The previous prime is 1168531633. The next prime is 1168531649. The reversal of 1168531638 is 8361358611.

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

1168531638 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 1168531638.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1168531631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 97377631 + ... + 97377642.

It is an arithmetic number, because the mean of its divisors is an integer number (292132911).

Almost surely, 2^1168531638 is an apocalyptic number.

1168531638 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1168531638 is a wasteful number, since it uses less digits than its factorization.

1168531638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194755278.

The product of its digits is 103680, while the sum is 42.

The square root of 1168531638 is about 34183.7920365778. The cubic root of 1168531638 is about 1053.2872452417.

The spelling of 1168531638 in words is "one billion, one hundred sixty-eight million, five hundred thirty-one thousand, six hundred thirty-eight".