140731531 has 2 divisors, whose sum is σ = 140731532. Its totient is φ = 140731530.

The previous prime is 140731529. The next prime is 140731541. The reversal of 140731531 is 135137041.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 140731531 - 2¹ = 140731529 is a prime.

It is a super-2 number, since 2×140731531² = 39610727635207922, which contains 22 as substring.

Together with 140731529, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 140731496 and 140731505.

It is not a weakly prime, because it can be changed into another prime (140731501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70365765 + 70365766.

It is an arithmetic number, because the mean of its divisors is an integer number (70365766).

Almost surely, 2^140731531 is an apocalyptic number.

140731531 is a deficient number, since it is larger than the sum of its proper divisors (1).

140731531 is an equidigital number, since it uses as much as digits as its factorization.

140731531 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

The square root of 140731531 is about 11863.0321166218. The cubic root of 140731531 is about 520.1522372308.

Adding to 140731531 its reverse (135137041), we get a palindrome (275868572).

The spelling of 140731531 in words is "one hundred forty million, seven hundred thirty-one thousand, five hundred thirty-one".