140689669 has 2 divisors, whose sum is σ = 140689670. Its totient is φ = 140689668.

The previous prime is 140689663. The next prime is 140689691. The reversal of 140689669 is 966986041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 94965025 + 45724644 = 9745^2 + 6762^2 .

It is a cyclic number.

It is not a de Polignac number, because 140689669 - 2⁷ = 140689541 is a prime.

It is a super-2 number, since 2×140689669² = 39587165926659122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140689663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70344834 + 70344835.

It is an arithmetic number, because the mean of its divisors is an integer number (70344835).

Almost surely, 2^140689669 is an apocalyptic number.

It is an amenable number.

140689669 is a deficient number, since it is larger than the sum of its proper divisors (1).

140689669 is an equidigital number, since it uses as much as digits as its factorization.

140689669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 559872, while the sum is 49.

The square root of 140689669 is about 11861.2675966779. The cubic root of 140689669 is about 520.1006572895.

The spelling of 140689669 in words is "one hundred forty million, six hundred eighty-nine thousand, six hundred sixty-nine".