261351126 has 12 divisors (see below), whose sum is σ = 566260812. Its totient is φ = 87117036.

The previous prime is 261351113. The next prime is 261351127. The reversal of 261351126 is 621153162.

It is a super-2 number, since 2×261351126² = 136608822122935752, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261351126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261351127) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 7259736 + ... + 7259771.

It is an arithmetic number, because the mean of its divisors is an integer number (47188401).

Almost surely, 2^261351126 is an apocalyptic number.

261351126 is an abundant number, since it is smaller than the sum of its proper divisors (304909686).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

261351126 is a wasteful number, since it uses less digits than its factorization.

261351126 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14519515 (or 14519512 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 261351126 is about 16166.3578458477. The cubic root of 261351126 is about 639.3541058637.

It can be divided in two parts, 26135 and 1126, that added together give a triangular number (27261 = T₂₃₃).

The spelling of 261351126 in words is "two hundred sixty-one million, three hundred fifty-one thousand, one hundred twenty-six".