261611429 has 2 divisors, whose sum is σ = 261611430. Its totient is φ = 261611428.

The previous prime is 261611417. The next prime is 261611473. The reversal of 261611429 is 924116162.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179292100 + 82319329 = 13390^2 + 9073^2 .

It is a cyclic number.

It is not a de Polignac number, because 261611429 - 2²⁰ = 260562853 is a prime.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 261611395 and 261611404.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261611479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130805714 + 130805715.

It is an arithmetic number, because the mean of its divisors is an integer number (130805715).

Almost surely, 2^261611429 is an apocalyptic number.

It is an amenable number.

261611429 is a deficient number, since it is larger than the sum of its proper divisors (1).

261611429 is an equidigital number, since it uses as much as digits as its factorization.

261611429 is an evil number, because the sum of its binary digits is even.

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

The square root of 261611429 is about 16174.4066042622. The cubic root of 261611429 is about 639.5662987759.

The spelling of 261611429 in words is "two hundred sixty-one million, six hundred eleven thousand, four hundred twenty-nine".