140591831 has 4 divisors (see below), whose sum is σ = 140635200. Its totient is φ = 140548464.

The previous prime is 140591821. The next prime is 140591833. The reversal of 140591831 is 138195041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 138195041 = 6841 ⋅20201.

It is a cyclic number.

It is not a de Polignac number, because 140591831 - 2⁶ = 140591767 is a prime.

It is a super-2 number, since 2×140591831² = 39532125887865122, 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 (140591833) 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, 16391 + ... + 23448.

It is an arithmetic number, because the mean of its divisors is an integer number (35158800).

Almost surely, 2^140591831 is an apocalyptic number.

140591831 is a deficient number, since it is larger than the sum of its proper divisors (43369).

140591831 is an equidigital number, since it uses as much as digits as its factorization.

140591831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43368.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 140591831 is about 11857.1426153184. The cubic root of 140591831 is about 519.9800670367.

The spelling of 140591831 in words is "one hundred forty million, five hundred ninety-one thousand, eight hundred thirty-one".