138553081 has 4 divisors (see below), whose sum is σ = 144577152. Its totient is φ = 132529012.

The previous prime is 138553057. The next prime is 138553117. The reversal of 138553081 is 180355831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-138553081 is a prime.

It is a super-2 number, since 2×138553081² = 38393912509185122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138553001) 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, 3012001 + ... + 3012046.

It is an arithmetic number, because the mean of its divisors is an integer number (36144288).

Almost surely, 2^138553081 is an apocalyptic number.

It is an amenable number.

138553081 is a deficient number, since it is larger than the sum of its proper divisors (6024071).

138553081 is an equidigital number, since it uses as much as digits as its factorization.

138553081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6024070.

The product of its (nonzero) digits is 14400, while the sum is 34.

The square root of 138553081 is about 11770.8572754919. The cubic root of 138553081 is about 517.4543742205.

The spelling of 138553081 in words is "one hundred thirty-eight million, five hundred fifty-three thousand, eighty-one".