140866981 has 6 divisors (see below), whose sum is σ = 149641010. Its totient is φ = 132580416.

The previous prime is 140866967. The next prime is 140866991. The reversal of 140866981 is 189668041.

140866981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 107122500 + 33744481 = 10350^2 + 5809^2 .

It is not a de Polignac number, because 140866981 - 2¹⁹ = 140342693 is a prime.

It is a super-2 number, since 2×140866981² = 39687012672108722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140866991) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 243426 + ... + 244003.

Almost surely, 2^140866981 is an apocalyptic number.

It is an amenable number.

140866981 is a deficient number, since it is larger than the sum of its proper divisors (8774029).

140866981 is an equidigital number, since it uses as much as digits as its factorization.

140866981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 487463 (or 487446 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 140866981 is about 11868.7396550771. The cubic root of 140866981 is about 520.3190608479.

The spelling of 140866981 in words is "one hundred forty million, eight hundred sixty-six thousand, nine hundred eighty-one".