140409961 has 2 divisors, whose sum is σ = 140409962. Its totient is φ = 140409960.

The previous prime is 140409959. The next prime is 140410003. The reversal of 140409961 is 169904041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93006736 + 47403225 = 9644^2 + 6885^2 .

It is a cyclic number.

It is not a de Polignac number, because 140409961 - 2¹ = 140409959 is a prime.

Together with 140409959, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (140404961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70204980 + 70204981.

It is an arithmetic number, because the mean of its divisors is an integer number (70204981).

Almost surely, 2^140409961 is an apocalyptic number.

It is an amenable number.

140409961 is a deficient number, since it is larger than the sum of its proper divisors (1).

140409961 is an equidigital number, since it uses as much as digits as its factorization.

140409961 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 140409961 is about 11849.4709164587. The cubic root of 140409961 is about 519.7557543779.

The spelling of 140409961 in words is "one hundred forty million, four hundred nine thousand, nine hundred sixty-one".