2147397257 has 2 divisors, whose sum is σ = 2147397258. Its totient is φ = 2147397256.

The previous prime is 2147397209. The next prime is 2147397269. The reversal of 2147397257 is 7527937412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1815100816 + 332296441 = 42604^2 + 18229^2 .

It is a cyclic number.

It is not a de Polignac number, because 2147397257 - 2⁶ = 2147397193 is a prime.

It is a super-2 number, since 2×2147397257² = 9222629958742248098, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (2147397557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1073698628 + 1073698629.

It is an arithmetic number, because the mean of its divisors is an integer number (1073698629).

Almost surely, 2^2147397257 is an apocalyptic number.

It is an amenable number.

2147397257 is a deficient number, since it is larger than the sum of its proper divisors (1).

2147397257 is an equidigital number, since it uses as much as digits as its factorization.

2147397257 is an evil number, because the sum of its binary digits is even.

The product of its digits is 740880, while the sum is 47.

The square root of 2147397257 is about 46340.0178787190. The cubic root of 2147397257 is about 1290.1418542801.

The spelling of 2147397257 in words is "two billion, one hundred forty-seven million, three hundred ninety-seven thousand, two hundred fifty-seven".