261430355 has 8 divisors (see below), whose sum is σ = 317688000. Its totient is φ = 206496576.

The previous prime is 261430339. The next prime is 261430361. The reversal of 261430355 is 553034162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261430355 - 2⁴ = 261430339 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 330530 + ... + 331319.

It is an arithmetic number, because the mean of its divisors is an integer number (39711000).

Almost surely, 2^261430355 is an apocalyptic number.

261430355 is a deficient number, since it is larger than the sum of its proper divisors (56257645).

261430355 is an equidigital number, since it uses as much as digits as its factorization.

261430355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 661933.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 261430355 is about 16168.8080884152. The cubic root of 261430355 is about 639.4187063998.

The spelling of 261430355 in words is "two hundred sixty-one million, four hundred thirty thousand, three hundred fifty-five".