261126155 has 4 divisors (see below), whose sum is σ = 313351392. Its totient is φ = 208900920.

The previous prime is 261126133. The next prime is 261126157. The reversal of 261126155 is 551621162.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 261126155 - 2¹⁰ = 261125131 is a prime.

It is a super-3 number, since 3×261126155³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261126157) 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 3 ways as a sum of consecutive naturals, for example, 26112611 + ... + 26112620.

It is an arithmetic number, because the mean of its divisors is an integer number (78337848).

Almost surely, 2^261126155 is an apocalyptic number.

261126155 is a deficient number, since it is larger than the sum of its proper divisors (52225237).

261126155 is an equidigital number, since it uses as much as digits as its factorization.

261126155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52225236.

The product of its digits is 3600, while the sum is 29.

The square root of 261126155 is about 16159.3983489485. The cubic root of 261126155 is about 639.1706012354.

The spelling of 261126155 in words is "two hundred sixty-one million, one hundred twenty-six thousand, one hundred fifty-five".