1138901681 has 8 divisors (see below), whose sum is σ = 1157466240. Its totient is φ = 1120452592.

The previous prime is 1138901671. The next prime is 1138901693. The reversal of 1138901681 is 1861098311.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1138901681 is a prime.

It is a super-2 number, since 2×1138901681² = 2594194077969251522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138901671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8870 + ... + 48543.

It is an arithmetic number, because the mean of its divisors is an integer number (144683280).

Almost surely, 2^1138901681 is an apocalyptic number.

It is an amenable number.

1138901681 is a deficient number, since it is larger than the sum of its proper divisors (18564559).

1138901681 is an equidigital number, since it uses as much as digits as its factorization.

1138901681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57735.

The product of its (nonzero) digits is 10368, while the sum is 38.

The square root of 1138901681 is about 33747.6174121967. The cubic root of 1138901681 is about 1044.3083359048.

Adding to 1138901681 its reverse (1861098311), we get a palindrome (2999999992).

The spelling of 1138901681 in words is "one billion, one hundred thirty-eight million, nine hundred one thousand, six hundred eighty-one".