140155231 has 4 divisors (see below), whose sum is σ = 144988200. Its totient is φ = 135322264.

The previous prime is 140155201. The next prime is 140155241. The reversal of 140155231 is 132551041.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 132551041 = 7 ⋅18935863.

It is a cyclic number.

It is not a de Polignac number, because 140155231 - 2⁵ = 140155199 is a prime.

It is a super-2 number, since 2×140155231² = 39286977553326722, 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 (140155201) 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, 2416441 + ... + 2416498.

It is an arithmetic number, because the mean of its divisors is an integer number (36247050).

Almost surely, 2^140155231 is an apocalyptic number.

140155231 is a deficient number, since it is larger than the sum of its proper divisors (4832969).

140155231 is an equidigital number, since it uses as much as digits as its factorization.

140155231 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4832968.

The product of its (nonzero) digits is 600, while the sum is 22.

The square root of 140155231 is about 11838.7174558733. The cubic root of 140155231 is about 519.4412526438.

The spelling of 140155231 in words is "one hundred forty million, one hundred fifty-five thousand, two hundred thirty-one".