140061721 has 2 divisors, whose sum is σ = 140061722. Its totient is φ = 140061720.

The previous prime is 140061577. The next prime is 140061763. The reversal of 140061721 is 127160041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 128255625 + 11806096 = 11325^2 + 3436^2 .

It is a cyclic number.

It is not a de Polignac number, because 140061721 - 2²¹ = 137964569 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 140061692 and 140061701.

It is not a weakly prime, because it can be changed into another prime (140061791) 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, 70030860 + 70030861.

It is an arithmetic number, because the mean of its divisors is an integer number (70030861).

Almost surely, 2^140061721 is an apocalyptic number.

It is an amenable number.

140061721 is a deficient number, since it is larger than the sum of its proper divisors (1).

140061721 is an equidigital number, since it uses as much as digits as its factorization.

140061721 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 336, while the sum is 22.

The square root of 140061721 is about 11834.7674670861. The cubic root of 140061721 is about 519.3257051477.

The spelling of 140061721 in words is "one hundred forty million, sixty-one thousand, seven hundred twenty-one".