140978861 has 2 divisors, whose sum is σ = 140978862. Its totient is φ = 140978860.

The previous prime is 140978839. The next prime is 140978923. The reversal of 140978861 is 168879041.

140978861 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85192900 + 55785961 = 9230^2 + 7469^2 .

It is a cyclic number.

It is not a de Polignac number, because 140978861 - 2⁶ = 140978797 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 (140978821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70489430 + 70489431.

It is an arithmetic number, because the mean of its divisors is an integer number (70489431).

Almost surely, 2^140978861 is an apocalyptic number.

It is an amenable number.

140978861 is a deficient number, since it is larger than the sum of its proper divisors (1).

140978861 is an equidigital number, since it uses as much as digits as its factorization.

140978861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 140978861 is about 11873.4519412006. The cubic root of 140978861 is about 520.4567744352.

The spelling of 140978861 in words is "one hundred forty million, nine hundred seventy-eight thousand, eight hundred sixty-one".