140408291 has 2 divisors, whose sum is σ = 140408292. Its totient is φ = 140408290.

The previous prime is 140408267. The next prime is 140408293. The reversal of 140408291 is 192804041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140408291 is a prime.

It is a Sophie Germain prime.

Together with 140408293, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140408293) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70204145 + 70204146.

It is an arithmetic number, because the mean of its divisors is an integer number (70204146).

Almost surely, 2^140408291 is an apocalyptic number.

140408291 is a deficient number, since it is larger than the sum of its proper divisors (1).

140408291 is an equidigital number, since it uses as much as digits as its factorization.

140408291 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 140408291 is about 11849.4004489679. The cubic root of 140408291 is about 519.7536937559.

The spelling of 140408291 in words is "one hundred forty million, four hundred eight thousand, two hundred ninety-one".