140291621 has 2 divisors, whose sum is σ = 140291622. Its totient is φ = 140291620.

The previous prime is 140291603. The next prime is 140291639. The reversal of 140291621 is 126192041.

It is a balanced prime because it is at equal distance from previous prime (140291603) and next prime (140291639).

It can be written as a sum of positive squares in only one way, i.e., 128006596 + 12285025 = 11314^2 + 3505^2 .

It is a cyclic number.

It is not a de Polignac number, because 140291621 - 2¹⁴ = 140275237 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 (140290621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70145810 + 70145811.

It is an arithmetic number, because the mean of its divisors is an integer number (70145811).

Almost surely, 2^140291621 is an apocalyptic number.

It is an amenable number.

140291621 is a deficient number, since it is larger than the sum of its proper divisors (1).

140291621 is an equidigital number, since it uses as much as digits as its factorization.

140291621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 140291621 is about 11844.4763919728. The cubic root of 140291621 is about 519.6096935533.

The spelling of 140291621 in words is "one hundred forty million, two hundred ninety-one thousand, six hundred twenty-one".