258181949 has 2 divisors, whose sum is σ = 258181950. Its totient is φ = 258181948.

The previous prime is 258181927. The next prime is 258181991. The reversal of 258181949 is 949181852.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236605924 + 21576025 = 15382^2 + 4645^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-258181949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (258181909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 129090974 + 129090975.

It is an arithmetic number, because the mean of its divisors is an integer number (129090975).

Almost surely, 2^258181949 is an apocalyptic number.

It is an amenable number.

258181949 is a deficient number, since it is larger than the sum of its proper divisors (1).

258181949 is an equidigital number, since it uses as much as digits as its factorization.

258181949 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 207360, while the sum is 47.

The square root of 258181949 is about 16068.0412309653. The cubic root of 258181949 is about 636.7592926768.

The spelling of 258181949 in words is "two hundred fifty-eight million, one hundred eighty-one thousand, nine hundred forty-nine".