140916821 has 2 divisors, whose sum is σ = 140916822. Its totient is φ = 140916820.

The previous prime is 140916779. The next prime is 140916851. The reversal of 140916821 is 128619041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 112678225 + 28238596 = 10615^2 + 5314^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140916821 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140916851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70458410 + 70458411.

It is an arithmetic number, because the mean of its divisors is an integer number (70458411).

Almost surely, 2^140916821 is an apocalyptic number.

It is an amenable number.

140916821 is a deficient number, since it is larger than the sum of its proper divisors (1).

140916821 is an equidigital number, since it uses as much as digits as its factorization.

140916821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3456, while the sum is 32.

The square root of 140916821 is about 11870.8391026077. The cubic root of 140916821 is about 520.3804181274.

The spelling of 140916821 in words is "one hundred forty million, nine hundred sixteen thousand, eight hundred twenty-one".