140405081 has 2 divisors, whose sum is σ = 140405082. Its totient is φ = 140405080.

The previous prime is 140405063. The next prime is 140405093. The reversal of 140405081 is 180504041.

140405081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76405081 + 64000000 = 8741^2 + 8000^2 .

It is a cyclic number.

It is not a de Polignac number, because 140405081 - 2⁶ = 140405017 is a prime.

It is a super-2 number, since 2×140405081² = 39427173541233122, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (140405021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70202540 + 70202541.

It is an arithmetic number, because the mean of its divisors is an integer number (70202541).

Almost surely, 2^140405081 is an apocalyptic number.

It is an amenable number.

140405081 is a deficient number, since it is larger than the sum of its proper divisors (1).

140405081 is an equidigital number, since it uses as much as digits as its factorization.

140405081 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 140405081 is about 11849.2649983026. The cubic root of 140405081 is about 519.7497328738.

The spelling of 140405081 in words is "one hundred forty million, four hundred five thousand, eighty-one".