140420435231 has 4 divisors (see below), whose sum is σ = 143686026792. Its totient is φ = 137154843672.

The previous prime is 140420435219. The next prime is 140420435273. The reversal of 140420435231 is 132534024041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132534024041 = 268237 ⋅494093.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140420435231 is a prime.

It is a super-2 number, since 2×140420435231² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140420435194 and 140420435203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140420435201) 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, 1632795716 + ... + 1632795801.

It is an arithmetic number, because the mean of its divisors is an integer number (35921506698).

Almost surely, 2^140420435231 is an apocalyptic number.

140420435231 is a deficient number, since it is larger than the sum of its proper divisors (3265591561).

140420435231 is an equidigital number, since it uses as much as digits as its factorization.

140420435231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3265591560.

The product of its (nonzero) digits is 11520, while the sum is 29.

Adding to 140420435231 its reverse (132534024041), we get a palindrome (272954459272).

The spelling of 140420435231 in words is "one hundred forty billion, four hundred twenty million, four hundred thirty-five thousand, two hundred thirty-one".