140644853 has 2 divisors, whose sum is σ = 140644854. Its totient is φ = 140644852.

The previous prime is 140644843. The next prime is 140644891. The reversal of 140644853 is 358446041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 127735204 + 12909649 = 11302^2 + 3593^2 .

It is a cyclic number.

It is not a de Polignac number, because 140644853 - 2⁶ = 140644789 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140644843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70322426 + 70322427.

It is an arithmetic number, because the mean of its divisors is an integer number (70322427).

Almost surely, 2^140644853 is an apocalyptic number.

It is an amenable number.

140644853 is a deficient number, since it is larger than the sum of its proper divisors (1).

140644853 is an equidigital number, since it uses as much as digits as its factorization.

140644853 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 35.

The square root of 140644853 is about 11859.3782720681. The cubic root of 140644853 is about 520.0454262584.

The spelling of 140644853 in words is "one hundred forty million, six hundred forty-four thousand, eight hundred fifty-three".