261935053 has 2 divisors, whose sum is σ = 261935054. Its totient is φ = 261935052.

The previous prime is 261935039. The next prime is 261935071. The reversal of 261935053 is 350539162.

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., 167883849 + 94051204 = 12957^2 + 9698^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261935053 is a prime.

It is a super-2 number, since 2×261935053² = 137219943980225618, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261932053) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130967526 + 130967527.

It is an arithmetic number, because the mean of its divisors is an integer number (130967527).

Almost surely, 2^261935053 is an apocalyptic number.

It is an amenable number.

261935053 is a deficient number, since it is larger than the sum of its proper divisors (1).

261935053 is an equidigital number, since it uses as much as digits as its factorization.

261935053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24300, while the sum is 34.

The square root of 261935053 is about 16184.4077123632. The cubic root of 261935053 is about 639.8299132978.

The spelling of 261935053 in words is "two hundred sixty-one million, nine hundred thirty-five thousand, fifty-three".