140144431 has 4 divisors (see below), whose sum is σ = 160165072. Its totient is φ = 120123792.

The previous prime is 140144429. The next prime is 140144449. The reversal of 140144431 is 134441041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 134441041 = 7 ⋅19205863.

It is a cyclic number.

It is not a de Polignac number, because 140144431 - 2¹ = 140144429 is a prime.

It is a super-2 number, since 2×140144431² = 39280923080627522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140144401) 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, 10010310 + ... + 10010323.

It is an arithmetic number, because the mean of its divisors is an integer number (40041268).

Almost surely, 2^140144431 is an apocalyptic number.

140144431 is a deficient number, since it is larger than the sum of its proper divisors (20020641).

140144431 is an equidigital number, since it uses as much as digits as its factorization.

140144431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20020640.

The product of its (nonzero) digits is 768, while the sum is 22.

The square root of 140144431 is about 11838.2613165954. The cubic root of 140144431 is about 519.4279100341.

Adding to 140144431 its reverse (134441041), we get a palindrome (274585472).

The spelling of 140144431 in words is "one hundred forty million, one hundred forty-four thousand, four hundred thirty-one".