261262553 has 2 divisors, whose sum is σ = 261262554. Its totient is φ = 261262552.

The previous prime is 261262541. The next prime is 261262567. The reversal of 261262553 is 355262162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 248787529 + 12475024 = 15773^2 + 3532^2 .

It is a cyclic number.

It is not a de Polignac number, because 261262553 - 2⁶ = 261262489 is a prime.

It is a super-3 number, since 3×261262553³ (a number of 26 digits) contains 333 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (261262153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130631276 + 130631277.

It is an arithmetic number, because the mean of its divisors is an integer number (130631277).

Almost surely, 2^261262553 is an apocalyptic number.

It is an amenable number.

261262553 is a deficient number, since it is larger than the sum of its proper divisors (1).

261262553 is an equidigital number, since it uses as much as digits as its factorization.

261262553 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 21600, while the sum is 32.

The square root of 261262553 is about 16163.6181902444. The cubic root of 261262553 is about 639.2818711009.

The spelling of 261262553 in words is "two hundred sixty-one million, two hundred sixty-two thousand, five hundred fifty-three".