140689691 has 2 divisors, whose sum is σ = 140689692. Its totient is φ = 140689690.

The previous prime is 140689669. The next prime is 140689693. The reversal of 140689691 is 196986041.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-140689691 is a prime.

It is a Sophie Germain prime.

Together with 140689693, 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 (140689693) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70344845 + 70344846.

It is an arithmetic number, because the mean of its divisors is an integer number (70344846).

Almost surely, 2^140689691 is an apocalyptic number.

140689691 is a deficient number, since it is larger than the sum of its proper divisors (1).

140689691 is an equidigital number, since it uses as much as digits as its factorization.

140689691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 140689691 is about 11861.2685240660. The cubic root of 140689691 is about 520.1006843993.

The spelling of 140689691 in words is "one hundred forty million, six hundred eighty-nine thousand, six hundred ninety-one".