261347601 has 8 divisors (see below), whose sum is σ = 348548320. Its totient is φ = 174189312.

The previous prime is 261347599. The next prime is 261347609. The reversal of 261347601 is 106743162.

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

It is not a de Polignac number, because 261347601 - 2¹ = 261347599 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261347609) 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, 8886 + ... + 24528.

It is an arithmetic number, because the mean of its divisors is an integer number (43568540).

Almost surely, 2^261347601 is an apocalyptic number.

It is an amenable number.

261347601 is a deficient number, since it is larger than the sum of its proper divisors (87200719).

261347601 is a wasteful number, since it uses less digits than its factorization.

261347601 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21215.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 261347601 is about 16166.2488227789. The cubic root of 261347601 is about 639.3512313995.

The spelling of 261347601 in words is "two hundred sixty-one million, three hundred forty-seven thousand, six hundred one".