140020031 has 4 divisors (see below), whose sum is σ = 140149464. Its totient is φ = 139890600.

The previous prime is 140019967. The next prime is 140020061. The reversal of 140020031 is 130020041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 130020041 = 659 ⋅197299.

It is a cyclic number.

It is not a de Polignac number, because 140020031 - 2⁶ = 140019967 is a prime.

It is a super-2 number, since 2×140020031² = 39211218162481922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140019994 and 140020021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140020061) 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, 63080 + ... + 65261.

It is an arithmetic number, because the mean of its divisors is an integer number (35037366).

Almost surely, 2^140020031 is an apocalyptic number.

140020031 is a deficient number, since it is larger than the sum of its proper divisors (129433).

140020031 is a wasteful number, since it uses less digits than its factorization.

140020031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129432.

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 140020031 is about 11833.0060001675. The cubic root of 140020031 is about 519.2741734921.

Adding to 140020031 its reverse (130020041), we get a palindrome (270040072).

The spelling of 140020031 in words is "one hundred forty million, twenty thousand, thirty-one".