1258187261 has 2 divisors, whose sum is σ = 1258187262. Its totient is φ = 1258187260.

The previous prime is 1258187233. The next prime is 1258187263. The reversal of 1258187261 is 1627818521.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1071318361 + 186868900 = 32731^2 + 13670^2 .

It is a cyclic number.

It is not a de Polignac number, because 1258187261 - 2¹⁴ = 1258170877 is a prime.

Together with 1258187263, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1258187263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 629093630 + 629093631.

It is an arithmetic number, because the mean of its divisors is an integer number (629093631).

Almost surely, 2^1258187261 is an apocalyptic number.

It is an amenable number.

1258187261 is a deficient number, since it is larger than the sum of its proper divisors (1).

1258187261 is an equidigital number, since it uses as much as digits as its factorization.

1258187261 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 53760, while the sum is 41.

The square root of 1258187261 is about 35470.9354401600. The cubic root of 1258187261 is about 1079.5640847654.

The spelling of 1258187261 in words is "one billion, two hundred fifty-eight million, one hundred eighty-seven thousand, two hundred sixty-one".