138493302981 has 16 divisors (see below), whose sum is σ = 201744160320. Its totient is φ = 83810603520.

The previous prime is 138493302979. The next prime is 138493302989. The reversal of 138493302981 is 189203394831.

It is not a de Polignac number, because 138493302981 - 2¹ = 138493302979 is a prime.

It is a super-2 number, since 2×138493302981² (a number of 23 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138493302989) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3095746 + ... + 3140163.

It is an arithmetic number, because the mean of its divisors is an integer number (12609010020).

Almost surely, 2^138493302981 is an apocalyptic number.

138493302981 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

138493302981 is a deficient number, since it is larger than the sum of its proper divisors (63250857339).

138493302981 is a wasteful number, since it uses less digits than its factorization.

138493302981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6236596.

The product of its (nonzero) digits is 1119744, while the sum is 51.

The spelling of 138493302981 in words is "one hundred thirty-eight billion, four hundred ninety-three million, three hundred two thousand, nine hundred eighty-one".