261201355 has 8 divisors (see below), whose sum is σ = 313707312. Its totient is φ = 208783968.

The previous prime is 261201349. The next prime is 261201377. The reversal of 261201355 is 553102162.

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 261201355 - 2¹⁵ = 261168587 is a prime.

It is a super-2 number, since 2×261201355² = 136452295707672050, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15469 + ... + 27598.

It is an arithmetic number, because the mean of its divisors is an integer number (39213414).

Almost surely, 2^261201355 is an apocalyptic number.

261201355 is a deficient number, since it is larger than the sum of its proper divisors (52505957).

261201355 is a wasteful number, since it uses less digits than its factorization.

261201355 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44285.

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 261201355 is about 16161.7250007541. The cubic root of 261201355 is about 639.2319521891.

The spelling of 261201355 in words is "two hundred sixty-one million, two hundred one thousand, three hundred fifty-five".