140209281 has 9 divisors (see below), whose sum is σ = 202575841. Its totient is φ = 93449172.

The previous prime is 140209273. The next prime is 140209331. The reversal of 140209281 is 182902041.

The square root of 140209281 is 11841.

It is a perfect power (a square), and thus also a powerful number.

140209281 is nontrivially palindromic in base 8.

It is a tau number, because it is divible by the number of its divisors (9).

It is not a de Polignac number, because 140209281 - 2³ = 140209273 is a prime.

It is a super-2 number, since 2×140209281² = 39317284957073922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140209211) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 33550 + ... + 37496.

Almost surely, 2^140209281 is an apocalyptic number.

140209281 is the 11841-st square number.

140209281 is the 5921-st centered octagonal number.

It is an amenable number.

140209281 is a deficient number, since it is larger than the sum of its proper divisors (62366560).

140209281 is an frugal number, since it uses more digits than its factorization.

140209281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7900 (or 3950 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 27.

The cubic root of 140209281 is about 519.5080171667.

The spelling of 140209281 in words is "one hundred forty million, two hundred nine thousand, two hundred eighty-one".