140247257 has 2 divisors, whose sum is σ = 140247258. Its totient is φ = 140247256.

The previous prime is 140247251. The next prime is 140247329. The reversal of 140247257 is 752742041.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 109599961 + 30647296 = 10469^2 + 5536^2 .

It is an emirp because it is prime and its reverse (752742041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140247257 - 2¹⁴ = 140230873 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (140247251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70123628 + 70123629.

It is an arithmetic number, because the mean of its divisors is an integer number (70123629).

Almost surely, 2^140247257 is an apocalyptic number.

It is an amenable number.

140247257 is a deficient number, since it is larger than the sum of its proper divisors (1).

140247257 is an equidigital number, since it uses as much as digits as its factorization.

140247257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15680, while the sum is 32.

The square root of 140247257 is about 11842.6034722100. The cubic root of 140247257 is about 519.5549162387.

Adding to 140247257 its reverse (752742041), we get a palindrome (892989298).

The spelling of 140247257 in words is "one hundred forty million, two hundred forty-seven thousand, two hundred fifty-seven".