140186881 has 4 divisors (see below), whose sum is σ = 140215252. Its totient is φ = 140158512.

The previous prime is 140186869. The next prime is 140186903. The reversal of 140186881 is 188681041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 188681041 = 853 ⋅221197.

It can be written as a sum of positive squares in 2 ways, for example, as 104366656 + 35820225 = 10216^2 + 5985^2 .

It is a cyclic number.

It is not a de Polignac number, because 140186881 - 2²⁷ = 5969153 is a prime.

It is a super-2 number, since 2×140186881² = 39304723209016322, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 140186881.

It is not an unprimeable number, because it can be changed into a prime (140186281) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4626 + ... + 17371.

It is an arithmetic number, because the mean of its divisors is an integer number (35053813).

Almost surely, 2^140186881 is an apocalyptic number.

It is an amenable number.

140186881 is a deficient number, since it is larger than the sum of its proper divisors (28371).

140186881 is an equidigital number, since it uses as much as digits as its factorization.

140186881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28370.

The product of its (nonzero) digits is 12288, while the sum is 37.

The square root of 140186881 is about 11840.0540961602. The cubic root of 140186881 is about 519.4803499555.

The spelling of 140186881 in words is "one hundred forty million, one hundred eighty-six thousand, eight hundred eighty-one".