140156581 has 2 divisors, whose sum is σ = 140156582. Its totient is φ = 140156580.

The previous prime is 140156567. The next prime is 140156591. The reversal of 140156581 is 185651041.

140156581 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., 131102500 + 9054081 = 11450^2 + 3009^2 .

It is a cyclic number.

It is not a de Polignac number, because 140156581 - 2¹⁹ = 139632293 is a prime.

It is a super-2 number, since 2×140156581² = 39287734395219122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140156501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70078290 + 70078291.

It is an arithmetic number, because the mean of its divisors is an integer number (70078291).

Almost surely, 2^140156581 is an apocalyptic number.

It is an amenable number.

140156581 is a deficient number, since it is larger than the sum of its proper divisors (1).

140156581 is an equidigital number, since it uses as much as digits as its factorization.

140156581 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4800, while the sum is 31.

The square root of 140156581 is about 11838.7744720473. The cubic root of 140156581 is about 519.4429204218.

The spelling of 140156581 in words is "one hundred forty million, one hundred fifty-six thousand, five hundred eighty-one".