138047059491 has 32 divisors (see below), whose sum is σ = 208763364096. Its totient is φ = 80405952000.

The previous prime is 138047059483. The next prime is 138047059531. The reversal of 138047059491 is 194950740831.

It is not a de Polignac number, because 138047059491 - 2³ = 138047059483 is a prime.

It is a super-2 number, since 2×138047059491² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (138047059411) 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 31 ways as a sum of consecutive naturals, for example, 670770 + ... + 852071.

It is an arithmetic number, because the mean of its divisors is an integer number (6523855128).

Almost surely, 2^138047059491 is an apocalyptic number.

138047059491 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

138047059491 is a deficient number, since it is larger than the sum of its proper divisors (70716304605).

138047059491 is a wasteful number, since it uses less digits than its factorization.

138047059491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1522963.

The product of its (nonzero) digits is 1088640, while the sum is 51.

The spelling of 138047059491 in words is "one hundred thirty-eight billion, forty-seven million, fifty-nine thousand, four hundred ninety-one".