140949821 has 2 divisors, whose sum is σ = 140949822. Its totient is φ = 140949820.

The previous prime is 140949811. The next prime is 140949857. The reversal of 140949821 is 128949041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 83356900 + 57592921 = 9130^2 + 7589^2 .

It is a cyclic number.

It is not a de Polignac number, because 140949821 - 2²² = 136755517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140949811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70474910 + 70474911.

It is an arithmetic number, because the mean of its divisors is an integer number (70474911).

Almost surely, 2^140949821 is an apocalyptic number.

It is an amenable number.

140949821 is a deficient number, since it is larger than the sum of its proper divisors (1).

140949821 is an equidigital number, since it uses as much as digits as its factorization.

140949821 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20736, while the sum is 38.

The square root of 140949821 is about 11872.2289819562. The cubic root of 140949821 is about 520.4210359740.

The spelling of 140949821 in words is "one hundred forty million, nine hundred forty-nine thousand, eight hundred twenty-one".