261418321 has 8 divisors (see below), whose sum is σ = 279842400. Its totient is φ = 243460800.

The previous prime is 261418303. The next prime is 261418343. The reversal of 261418321 is 123814162.

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 261418321 - 2⁷ = 261418193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 261418321.

It is not an unprimeable number, because it can be changed into a prime (261418361) 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, 115480 + ... + 117721.

It is an arithmetic number, because the mean of its divisors is an integer number (34980300).

Almost surely, 2^261418321 is an apocalyptic number.

It is an amenable number.

261418321 is a deficient number, since it is larger than the sum of its proper divisors (18424079).

261418321 is a wasteful number, since it uses less digits than its factorization.

261418321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233279.

The product of its digits is 2304, while the sum is 28.

The square root of 261418321 is about 16168.4359478584. The cubic root of 261418321 is about 639.4088951408.

The spelling of 261418321 in words is "two hundred sixty-one million, four hundred eighteen thousand, three hundred twenty-one".