140731 has 2 divisors, whose sum is σ = 140732. Its totient is φ = 140730.

The previous prime is 140729. The next prime is 140741. The reversal of 140731 is 137041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140731 - 2¹ = 140729 is a prime.

It is a super-2 number, since 2×140731² = 39610428722, which contains 22 as substring.

Together with 140729, it forms a pair of twin primes.

It is an Ulam number.

It is a plaindrome in base 16.

It is not a weakly prime, because it can be changed into another prime (140741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70365 + 70366.

It is an arithmetic number, because the mean of its divisors is an integer number (70366).

2¹⁴⁰⁷³¹ is an apocalyptic number.

140731 is a deficient number, since it is larger than the sum of its proper divisors (1).

140731 is an equidigital number, since it uses as much as digits as its factorization.

140731 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 84, while the sum is 16.

The square root of 140731 is about 375.1413067099. The cubic root of 140731 is about 52.0151583027.

Subtracting from 140731 its sum of digits (16), we obtain a triangular number (140715 = T₅₃₀).

Adding to 140731 its reverse (137041), we get a palindrome (277772).

The spelling of 140731 in words is "one hundred forty thousand, seven hundred thirty-one".