140645749 has 2 divisors, whose sum is σ = 140645750. Its totient is φ = 140645748.

The previous prime is 140645731. The next prime is 140645753. The reversal of 140645749 is 947546041.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 82992100 + 57653649 = 9110^2 + 7593^2 .

It is a cyclic number.

It is not a de Polignac number, because 140645749 - 2⁹ = 140645237 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (140646749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70322874 + 70322875.

It is an arithmetic number, because the mean of its divisors is an integer number (70322875).

Almost surely, 2^140645749 is an apocalyptic number.

It is an amenable number.

140645749 is a deficient number, since it is larger than the sum of its proper divisors (1).

140645749 is an equidigital number, since it uses as much as digits as its factorization.

140645749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 120960, while the sum is 40.

The square root of 140645749 is about 11859.4160480186. The cubic root of 140645749 is about 520.0465305995.

The spelling of 140645749 in words is "one hundred forty million, six hundred forty-five thousand, seven hundred forty-nine".