138313553 has 4 divisors (see below), whose sum is σ = 158072640. Its totient is φ = 118554468.

The previous prime is 138313531. The next prime is 138313573. The reversal of 138313553 is 355313831.

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 not a de Polignac number, because 138313553 - 2⁶ = 138313489 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (138313573) 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, 9879533 + ... + 9879546.

It is an arithmetic number, because the mean of its divisors is an integer number (39518160).

Almost surely, 2^138313553 is an apocalyptic number.

It is an amenable number.

138313553 is a deficient number, since it is larger than the sum of its proper divisors (19759087).

138313553 is an equidigital number, since it uses as much as digits as its factorization.

138313553 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19759086.

The product of its digits is 16200, while the sum is 32.

The square root of 138313553 is about 11760.6782542505. The cubic root of 138313553 is about 517.1560137085.

The spelling of 138313553 in words is "one hundred thirty-eight million, three hundred thirteen thousand, five hundred fifty-three".