138455231 has 4 divisors (see below), whose sum is σ = 140351952. Its totient is φ = 136558512.

The previous prime is 138455201. The next prime is 138455243. The reversal of 138455231 is 132554831.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 138455231 - 2⁶ = 138455167 is a prime.

It is a super-2 number, since 2×138455231² = 38339701982526722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138455201) 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, 948251 + ... + 948396.

It is an arithmetic number, because the mean of its divisors is an integer number (35087988).

Almost surely, 2^138455231 is an apocalyptic number.

138455231 is a deficient number, since it is larger than the sum of its proper divisors (1896721).

138455231 is an equidigital number, since it uses as much as digits as its factorization.

138455231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1896720.

The product of its digits is 14400, while the sum is 32.

The square root of 138455231 is about 11766.7000896598. The cubic root of 138455231 is about 517.3325320252.

The spelling of 138455231 in words is "one hundred thirty-eight million, four hundred fifty-five thousand, two hundred thirty-one".