261252355 has 16 divisors (see below), whose sum is σ = 385850304. Its totient is φ = 165363840.

The previous prime is 261252353. The next prime is 261252359. The reversal of 261252355 is 553252162.

It is a happy number.

It is not a de Polignac number, because 261252355 - 2¹ = 261252353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261252353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 286636 + ... + 287545.

It is an arithmetic number, because the mean of its divisors is an integer number (24115644).

Almost surely, 2^261252355 is an apocalyptic number.

261252355 is a deficient number, since it is larger than the sum of its proper divisors (124597949).

261252355 is a wasteful number, since it uses less digits than its factorization.

261252355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 574206.

The product of its digits is 18000, while the sum is 31.

The square root of 261252355 is about 16163.3027256189. The cubic root of 261252355 is about 639.2735531831.

The spelling of 261252355 in words is "two hundred sixty-one million, two hundred fifty-two thousand, three hundred fifty-five".