261351201 has 8 divisors (see below), whose sum is σ = 351012384. Its totient is φ = 172962080.

The previous prime is 261351151. The next prime is 261351203. The reversal of 261351201 is 102153162.

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 261351201 - 2¹³ = 261343009 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (261351203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 317535 + ... + 318356.

It is an arithmetic number, because the mean of its divisors is an integer number (43876548).

Almost surely, 2^261351201 is an apocalyptic number.

It is an amenable number.

261351201 is a deficient number, since it is larger than the sum of its proper divisors (89661183).

261351201 is a wasteful number, since it uses less digits than its factorization.

261351201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636031.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 261351201 is about 16166.3601654794. The cubic root of 261351201 is about 639.3541670222.

The spelling of 261351201 in words is "two hundred sixty-one million, three hundred fifty-one thousand, two hundred one".