2140209257 has 2 divisors, whose sum is σ = 2140209258. Its totient is φ = 2140209256.

The previous prime is 2140209233. The next prime is 2140209277. The reversal of 2140209257 is 7529020412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1689538816 + 450670441 = 41104^2 + 21229^2 .

It is a cyclic number.

It is not a de Polignac number, because 2140209257 - 2²² = 2136014953 is a prime.

It is not a weakly prime, because it can be changed into another prime (2140209277) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1070104628 + 1070104629.

It is an arithmetic number, because the mean of its divisors is an integer number (1070104629).

Almost surely, 2^2140209257 is an apocalyptic number.

It is an amenable number.

2140209257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2140209257 is an equidigital number, since it uses as much as digits as its factorization.

2140209257 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10080, while the sum is 32.

The square root of 2140209257 is about 46262.3957118522. The cubic root of 2140209257 is about 1288.7007444227.

Adding to 2140209257 its reverse (7529020412), we get a palindrome (9669229669).

The spelling of 2140209257 in words is "two billion, one hundred forty million, two hundred nine thousand, two hundred fifty-seven".