261946753 has 2 divisors, whose sum is σ = 261946754. Its totient is φ = 261946752.

The previous prime is 261946721. The next prime is 261946823. The reversal of 261946753 is 357649162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 181521729 + 80425024 = 13473^2 + 8968^2 .

It is a cyclic number.

It is not a de Polignac number, because 261946753 - 2⁵ = 261946721 is a prime.

It is a super-2 number, since 2×261946753² = 137232202814486018, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (261946453) 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, 130973376 + 130973377.

It is an arithmetic number, because the mean of its divisors is an integer number (130973377).

Almost surely, 2^261946753 is an apocalyptic number.

It is an amenable number.

261946753 is a deficient number, since it is larger than the sum of its proper divisors (1).

261946753 is an equidigital number, since it uses as much as digits as its factorization.

261946753 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 272160, while the sum is 43.

The square root of 261946753 is about 16184.7691673375. The cubic root of 261946753 is about 639.8394397032.

The spelling of 261946753 in words is "two hundred sixty-one million, nine hundred forty-six thousand, seven hundred fifty-three".