257219047 has 2 divisors, whose sum is σ = 257219048. Its totient is φ = 257219046.

The previous prime is 257219003. The next prime is 257219057. The reversal of 257219047 is 740912752.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 257219047 - 2¹⁹ = 256694759 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 257218997 and 257219015.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (257219057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 128609523 + 128609524.

It is an arithmetic number, because the mean of its divisors is an integer number (128609524).

Almost surely, 2^257219047 is an apocalyptic number.

257219047 is a deficient number, since it is larger than the sum of its proper divisors (1).

257219047 is an equidigital number, since it uses as much as digits as its factorization.

257219047 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 35280, while the sum is 37.

The square root of 257219047 is about 16038.0499749814. The cubic root of 257219047 is about 635.9666983803.

The spelling of 257219047 in words is "two hundred fifty-seven million, two hundred nineteen thousand, forty-seven".