261136629 has 20 divisors (see below), whose sum is σ = 420101836. Its totient is φ = 160698816.

The previous prime is 261136613. The next prime is 261136637. The reversal of 261136629 is 926631162.

It is a happy number.

261136629 is a `hidden beast` number, since 2 + 611 + 36 + 6 + 2 + 9 = 666.

261136629 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 141562404 + 119574225 = 11898^2 + 10935^2 .

It is not a de Polignac number, because 261136629 - 2⁴ = 261136613 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 261136593 and 261136602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261136129) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 122944 + ... + 125049.

Almost surely, 2^261136629 is an apocalyptic number.

It is an amenable number.

261136629 is a deficient number, since it is larger than the sum of its proper divisors (158965207).

261136629 is a wasteful number, since it uses less digits than its factorization.

261136629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 248018 (or 248009 counting only the distinct ones).

The product of its digits is 23328, while the sum is 36.

The square root of 261136629 is about 16159.7224295469. The cubic root of 261136629 is about 639.1791470197.

The spelling of 261136629 in words is "two hundred sixty-one million, one hundred thirty-six thousand, six hundred twenty-nine".