261325049 has 2 divisors, whose sum is σ = 261325050. Its totient is φ = 261325048.

The previous prime is 261325027. The next prime is 261325073. The reversal of 261325049 is 940523162.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 176039824 + 85285225 = 13268^2 + 9235^2 .

It is a cyclic number.

It is not a de Polignac number, because 261325049 - 2¹⁶ = 261259513 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261325549) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130662524 + 130662525.

It is an arithmetic number, because the mean of its divisors is an integer number (130662525).

Almost surely, 2^261325049 is an apocalyptic number.

It is an amenable number.

261325049 is a deficient number, since it is larger than the sum of its proper divisors (1).

261325049 is an equidigital number, since it uses as much as digits as its factorization.

261325049 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 261325049 is about 16165.5513051674. The cubic root of 261325049 is about 639.3328407407.

The spelling of 261325049 in words is "two hundred sixty-one million, three hundred twenty-five thousand, forty-nine".