538258261 has 2 divisors, whose sum is σ = 538258262. Its totient is φ = 538258260.

The previous prime is 538258247. The next prime is 538258271. The reversal of 538258261 is 162852835.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 328298161 + 209960100 = 18119^2 + 14490^2 .

It is a cyclic number.

It is not a de Polignac number, because 538258261 - 2⁹ = 538257749 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (538258271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 269129130 + 269129131.

It is an arithmetic number, because the mean of its divisors is an integer number (269129131).

Almost surely, 2^538258261 is an apocalyptic number.

It is an amenable number.

538258261 is a deficient number, since it is larger than the sum of its proper divisors (1).

538258261 is an equidigital number, since it uses as much as digits as its factorization.

538258261 is an evil number, because the sum of its binary digits is even.

The product of its digits is 115200, while the sum is 40.

The square root of 538258261 is about 23200.3935526965. The cubic root of 538258261 is about 813.4488221556.

The spelling of 538258261 in words is "five hundred thirty-eight million, two hundred fifty-eight thousand, two hundred sixty-one".