140780257 has 2 divisors, whose sum is σ = 140780258. Its totient is φ = 140780256.

The previous prime is 140780251. The next prime is 140780261. The reversal of 140780257 is 752087041.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 132917841 + 7862416 = 11529^2 + 2804^2 .

It is an emirp because it is prime and its reverse (752087041) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 140780257 - 2³ = 140780249 is a prime.

It is not a weakly prime, because it can be changed into another prime (140780251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 70390128 + 70390129.

It is an arithmetic number, because the mean of its divisors is an integer number (70390129).

Almost surely, 2^140780257 is an apocalyptic number.

It is an amenable number.

140780257 is a deficient number, since it is larger than the sum of its proper divisors (1).

140780257 is an equidigital number, since it uses as much as digits as its factorization.

140780257 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 34.

The square root of 140780257 is about 11865.0856296952. The cubic root of 140780257 is about 520.2122617167.

The spelling of 140780257 in words is "one hundred forty million, seven hundred eighty thousand, two hundred fifty-seven".