138311465 has 4 divisors (see below), whose sum is σ = 165973764. Its totient is φ = 110649168.

The previous prime is 138311441. The next prime is 138311483. The reversal of 138311465 is 564113831.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 564113831 = 181 ⋅3116651.

It can be written as a sum of positive squares in 2 ways, for example, as 107163904 + 31147561 = 10352^2 + 5581^2 .

It is a cyclic number.

It is not a de Polignac number, because 138311465 - 2¹⁰ = 138310441 is a prime.

It is a super-2 number, since 2×138311465² = 38260122700892450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13831142 + ... + 13831151.

It is an arithmetic number, because the mean of its divisors is an integer number (41493441).

Almost surely, 2^138311465 is an apocalyptic number.

It is an amenable number.

138311465 is a deficient number, since it is larger than the sum of its proper divisors (27662299).

138311465 is an equidigital number, since it uses as much as digits as its factorization.

138311465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27662298.

The product of its digits is 8640, while the sum is 32.

The square root of 138311465 is about 11760.5894835250. The cubic root of 138311465 is about 517.1534113432.

The spelling of 138311465 in words is "one hundred thirty-eight million, three hundred eleven thousand, four hundred sixty-five".