140311321 has 4 divisors (see below), whose sum is σ = 141700644. Its totient is φ = 138922000.

The previous prime is 140311291. The next prime is 140311331. The reversal of 140311321 is 123113041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 123113041 = 101 ⋅1218941.

It can be written as a sum of positive squares in 2 ways, for example, as 115670025 + 24641296 = 10755^2 + 4964^2 .

It is a cyclic number.

It is not a de Polignac number, because 140311321 - 2¹³ = 140303129 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140311295 and 140311304.

It is not an unprimeable number, because it can be changed into a prime (140311331) 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, 694510 + ... + 694711.

It is an arithmetic number, because the mean of its divisors is an integer number (35425161).

Almost surely, 2^140311321 is an apocalyptic number.

It is an amenable number.

140311321 is a deficient number, since it is larger than the sum of its proper divisors (1389323).

140311321 is a wasteful number, since it uses less digits than its factorization.

140311321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1389322.

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 140311321 is about 11845.3079740461. The cubic root of 140311321 is about 519.6340139220.

Adding to 140311321 its reverse (123113041), we get a palindrome (263424362).

The spelling of 140311321 in words is "one hundred forty million, three hundred eleven thousand, three hundred twenty-one".