140129281 has 2 divisors, whose sum is σ = 140129282. Its totient is φ = 140129280.

The previous prime is 140129243. The next prime is 140129291. The reversal of 140129281 is 182921041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 138650625 + 1478656 = 11775^2 + 1216^2 .

It is a cyclic number.

It is not a de Polignac number, because 140129281 - 2²³ = 131740673 is a prime.

It is a super-2 number, since 2×140129281² = 39272430787153922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (140129291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70064640 + 70064641.

It is an arithmetic number, because the mean of its divisors is an integer number (70064641).

Almost surely, 2^140129281 is an apocalyptic number.

It is an amenable number.

140129281 is a deficient number, since it is larger than the sum of its proper divisors (1).

140129281 is an equidigital number, since it uses as much as digits as its factorization.

140129281 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 140129281 is about 11837.6214249316. The cubic root of 140129281 is about 519.4091921624.

The spelling of 140129281 in words is "one hundred forty million, one hundred twenty-nine thousand, two hundred eighty-one".