261129416 has 8 divisors (see below), whose sum is σ = 489617670. Its totient is φ = 130564704.

The previous prime is 261129413. The next prime is 261129433. The reversal of 261129416 is 614921162.

It can be written as a sum of positive squares in only one way, i.e., 260822500 + 306916 = 16150^2 + 554^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (261129413) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16320581 + ... + 16320596.

Almost surely, 2^261129416 is an apocalyptic number.

It is an amenable number.

261129416 is a deficient number, since it is larger than the sum of its proper divisors (228488254).

261129416 is a wasteful number, since it uses less digits than its factorization.

261129416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32641183 (or 32641179 counting only the distinct ones).

The product of its digits is 5184, while the sum is 32.

The square root of 261129416 is about 16159.4992496674. The cubic root of 261129416 is about 639.1732619247.

The spelling of 261129416 in words is "two hundred sixty-one million, one hundred twenty-nine thousand, four hundred sixteen".