140321813 has 2 divisors, whose sum is σ = 140321814. Its totient is φ = 140321812.

The previous prime is 140321789. The next prime is 140321861. The reversal of 140321813 is 318123041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 92891044 + 47430769 = 9638^2 + 6887^2 .

It is an emirp because it is prime and its reverse (318123041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140321813 - 2¹⁸ = 140059669 is a prime.

It is a super-2 number, since 2×140321813² = 39380422407213938, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140320813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70160906 + 70160907.

It is an arithmetic number, because the mean of its divisors is an integer number (70160907).

Almost surely, 2^140321813 is an apocalyptic number.

It is an amenable number.

140321813 is a deficient number, since it is larger than the sum of its proper divisors (1).

140321813 is an equidigital number, since it uses as much as digits as its factorization.

140321813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 140321813 is about 11845.7508415465. The cubic root of 140321813 is about 519.6469657498.

Adding to 140321813 its reverse (318123041), we get a palindrome (458444854).

The spelling of 140321813 in words is "one hundred forty million, three hundred twenty-one thousand, eight hundred thirteen".