261323401 has 8 divisors (see below), whose sum is σ = 272865600. Its totient is φ = 249796272.

The previous prime is 261323399. The next prime is 261323423. The reversal of 261323401 is 104323162.

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 261323401 - 2¹ = 261323399 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261323441) 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, 45571 + ... + 50983.

It is an arithmetic number, because the mean of its divisors is an integer number (34108200).

Almost surely, 2^261323401 is an apocalyptic number.

It is an amenable number.

261323401 is a deficient number, since it is larger than the sum of its proper divisors (11542199).

261323401 is a wasteful number, since it uses less digits than its factorization.

261323401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7535.

The product of its (nonzero) digits is 864, while the sum is 22.

The square root of 261323401 is about 16165.5003324982. The cubic root of 261323401 is about 639.3314967915.

Adding to 261323401 its reverse (104323162), we get a palindrome (365646563).

The spelling of 261323401 in words is "two hundred sixty-one million, three hundred twenty-three thousand, four hundred one".