140247191 has 4 divisors (see below), whose sum is σ = 160282512. Its totient is φ = 120211872.

The previous prime is 140247187. The next prime is 140247197. The reversal of 140247191 is 191742041.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 191742041 = 5227 ⋅36683.

It is a cyclic number.

It is not a de Polignac number, because 140247191 - 2² = 140247187 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140247197) 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, 10017650 + ... + 10017663.

It is an arithmetic number, because the mean of its divisors is an integer number (40070628).

Almost surely, 2^140247191 is an apocalyptic number.

140247191 is a deficient number, since it is larger than the sum of its proper divisors (20035321).

140247191 is an equidigital number, since it uses as much as digits as its factorization.

140247191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20035320.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 140247191 is about 11842.6006856602. The cubic root of 140247191 is about 519.5548347383.

The spelling of 140247191 in words is "one hundred forty million, two hundred forty-seven thousand, one hundred ninety-one".