138105202801489 has 45 divisors (see below), whose sum is σ = 177099436298729. Its totient is φ = 107609507978280.

The previous prime is 138105202801469. The next prime is 138105202801541. The reversal of 138105202801489 is 984108202501831.

The square root of 138105202801489 is 11751817.

It is a perfect power (a square), and thus also a powerful number.

It is a de Polignac number, because none of the positive numbers 2^k-138105202801489 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138105202801429) by changing a digit.

It is a polite number, since it can be written in 44 ways as a sum of consecutive naturals, for example, 6334218462 + ... + 6334240264.

Almost surely, 2^{138105202801489} is an apocalyptic number.

138105202801489 is the 11751817-th square number.

138105202801489 is the 5875909-th centered octagonal number.

It is an amenable number.

138105202801489 is a deficient number, since it is larger than the sum of its proper divisors (38994233497240).

138105202801489 is an frugal number, since it uses more digits than its factorization.

138105202801489 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43656 (or 21821 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 52.

The spelling of 138105202801489 in words is "one hundred thirty-eight trillion, one hundred five billion, two hundred two million, eight hundred one thousand, four hundred eighty-nine".