140386531 has 4 divisors (see below), whose sum is σ = 140514912. Its totient is φ = 140258152.

The previous prime is 140386513. The next prime is 140386537. The reversal of 140386531 is 135683041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 135683041 = 13 ⋅10437157.

It is a cyclic number.

It is not a de Polignac number, because 140386531 - 2⁷ = 140386403 is a prime.

It is a super-2 number, since 2×140386531² = 39416756172427922, which contains 22 as substring.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140386493 and 140386502.

It is not an unprimeable number, because it can be changed into a prime (140386537) 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, 62536 + ... + 64741.

It is an arithmetic number, because the mean of its divisors is an integer number (35128728).

Almost surely, 2^140386531 is an apocalyptic number.

140386531 is a deficient number, since it is larger than the sum of its proper divisors (128381).

140386531 is a wasteful number, since it uses less digits than its factorization.

140386531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128380.

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 140386531 is about 11848.4822234749. The cubic root of 140386531 is about 519.7268424814.

The spelling of 140386531 in words is "one hundred forty million, three hundred eighty-six thousand, five hundred thirty-one".