140681621 has 2 divisors, whose sum is σ = 140681622. Its totient is φ = 140681620.

The previous prime is 140681609. The next prime is 140681633. The reversal of 140681621 is 126186041.

It is a balanced prime because it is at equal distance from previous prime (140681609) and next prime (140681633).

It can be written as a sum of positive squares in only one way, i.e., 91891396 + 48790225 = 9586^2 + 6985^2 .

It is a cyclic number.

It is not a de Polignac number, because 140681621 - 2¹⁰ = 140680597 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140681641) 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, 70340810 + 70340811.

It is an arithmetic number, because the mean of its divisors is an integer number (70340811).

Almost surely, 2^140681621 is an apocalyptic number.

It is an amenable number.

140681621 is a deficient number, since it is larger than the sum of its proper divisors (1).

140681621 is an equidigital number, since it uses as much as digits as its factorization.

140681621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 140681621 is about 11860.9283363487. The cubic root of 140681621 is about 520.0907398356.

The spelling of 140681621 in words is "one hundred forty million, six hundred eighty-one thousand, six hundred twenty-one".