261025049 has 2 divisors, whose sum is σ = 261025050. Its totient is φ = 261025048.

The previous prime is 261025031. The next prime is 261025057. The reversal of 261025049 is 940520162.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 244703449 + 16321600 = 15643^2 + 4040^2 .

It is a cyclic number.

It is not a de Polignac number, because 261025049 - 2¹² = 261020953 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261025019) 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, 130512524 + 130512525.

It is an arithmetic number, because the mean of its divisors is an integer number (130512525).

Almost surely, 2^261025049 is an apocalyptic number.

It is an amenable number.

261025049 is a deficient number, since it is larger than the sum of its proper divisors (1).

261025049 is an equidigital number, since it uses as much as digits as its factorization.

261025049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 261025049 is about 16156.2696498913. The cubic root of 261025049 is about 639.0880966376.

The spelling of 261025049 in words is "two hundred sixty-one million, twenty-five thousand, forty-nine".