140878681 has 4 divisors (see below), whose sum is σ = 140902452. Its totient is φ = 140854912.

The previous prime is 140878679. The next prime is 140878691. The reversal of 140878681 is 186878041.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 54686025 + 86192656 = 7395^2 + 9284^2 .

It is a cyclic number.

It is not a de Polignac number, because 140878681 - 2¹ = 140878679 is a prime.

It is a super-2 number, since 2×140878681² = 39693605520599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (140878631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5025 + ... + 17521.

It is an arithmetic number, because the mean of its divisors is an integer number (35225613).

Almost surely, 2^140878681 is an apocalyptic number.

It is an amenable number.

140878681 is a deficient number, since it is larger than the sum of its proper divisors (23771).

140878681 is a wasteful number, since it uses less digits than its factorization.

140878681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23770.

The product of its (nonzero) digits is 86016, while the sum is 43.

The square root of 140878681 is about 11869.2325362679. The cubic root of 140878681 is about 520.3334658429. Note that the first 3 decimals are identical.

It can be divided in two parts, 1408 and 78681, that added together give a square (80089 = 283²).

The spelling of 140878681 in words is "one hundred forty million, eight hundred seventy-eight thousand, six hundred eighty-one".