140785321 has 2 divisors, whose sum is σ = 140785322. Its totient is φ = 140785320.

The previous prime is 140785301. The next prime is 140785339. The reversal of 140785321 is 123587041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 101284096 + 39501225 = 10064^2 + 6285^2 .

It is an emirp because it is prime and its reverse (123587041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140785321 - 2⁵ = 140785289 is a prime.

It is not a weakly prime, because it can be changed into another prime (140785301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70392660 + 70392661.

It is an arithmetic number, because the mean of its divisors is an integer number (70392661).

Almost surely, 2^140785321 is an apocalyptic number.

It is an amenable number.

140785321 is a deficient number, since it is larger than the sum of its proper divisors (1).

140785321 is an equidigital number, since it uses as much as digits as its factorization.

140785321 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 140785321 is about 11865.2990269946. The cubic root of 140785321 is about 520.2184991522.

The spelling of 140785321 in words is "one hundred forty million, seven hundred eighty-five thousand, three hundred twenty-one".