261078801 has 8 divisors (see below), whose sum is σ = 349076160. Its totient is φ = 173566992.

The previous prime is 261078787. The next prime is 261078817. The reversal of 261078801 is 108870162.

It is a happy number.

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

It is not a de Polignac number, because 261078801 - 2⁶ = 261078737 is a prime.

It is not an unprimeable number, because it can be changed into a prime (269078801) 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, 120130 + ... + 122283.

It is an arithmetic number, because the mean of its divisors is an integer number (43634520).

Almost surely, 2^261078801 is an apocalyptic number.

It is an amenable number.

261078801 is a deficient number, since it is larger than the sum of its proper divisors (87997359).

261078801 is a wasteful number, since it uses less digits than its factorization.

261078801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242775.

The product of its (nonzero) digits is 5376, while the sum is 33.

The square root of 261078801 is about 16157.9330670727. The cubic root of 261078801 is about 639.1319620389.

The spelling of 261078801 in words is "two hundred sixty-one million, seventy-eight thousand, eight hundred one".