140579921 has 2 divisors, whose sum is σ = 140579922. Its totient is φ = 140579920.

The previous prime is 140579911. The next prime is 140579941. The reversal of 140579921 is 129975041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 136422400 + 4157521 = 11680^2 + 2039^2 .

It is a cyclic number.

It is not a de Polignac number, because 140579921 - 2¹⁰ = 140578897 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140579911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70289960 + 70289961.

It is an arithmetic number, because the mean of its divisors is an integer number (70289961).

Almost surely, 2^140579921 is an apocalyptic number.

It is an amenable number.

140579921 is a deficient number, since it is larger than the sum of its proper divisors (1).

140579921 is an equidigital number, since it uses as much as digits as its factorization.

140579921 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 140579921 is about 11856.6403757557. The cubic root of 140579921 is about 519.9653835438.

The spelling of 140579921 in words is "one hundred forty million, five hundred seventy-nine thousand, nine hundred twenty-one".