140817869 has 2 divisors, whose sum is σ = 140817870. Its totient is φ = 140817868.

The previous prime is 140817793. The next prime is 140817871. The reversal of 140817869 is 968718041.

140817869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 108951844 + 31866025 = 10438^2 + 5645^2 .

It is an emirp because it is prime and its reverse (968718041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140817869 - 2¹² = 140813773 is a prime.

It is a super-2 number, since 2×140817869² = 39659344459402322, which contains 22 as substring.

Together with 140817871, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140817889) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70408934 + 70408935.

It is an arithmetic number, because the mean of its divisors is an integer number (70408935).

Almost surely, 2^140817869 is an apocalyptic number.

It is an amenable number.

140817869 is a deficient number, since it is larger than the sum of its proper divisors (1).

140817869 is an equidigital number, since it uses as much as digits as its factorization.

140817869 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96768, while the sum is 44.

The square root of 140817869 is about 11866.6705102990. The cubic root of 140817869 is about 520.2585856397.

The spelling of 140817869 in words is "one hundred forty million, eight hundred seventeen thousand, eight hundred sixty-nine".