261803401 has 4 divisors (see below), whose sum is σ = 270248704. Its totient is φ = 253358100.

The previous prime is 261803389. The next prime is 261803429. The reversal of 261803401 is 104308162.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 261803401 - 2⁹ = 261802889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261803461) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4222605 + ... + 4222666.

It is an arithmetic number, because the mean of its divisors is an integer number (67562176).

Almost surely, 2^261803401 is an apocalyptic number.

It is an amenable number.

261803401 is a deficient number, since it is larger than the sum of its proper divisors (8445303).

261803401 is an equidigital number, since it uses as much as digits as its factorization.

261803401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8445302.

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 261803401 is about 16180.3399531654. The cubic root of 261803401 is about 639.7226996924.

The spelling of 261803401 in words is "two hundred sixty-one million, eight hundred three thousand, four hundred one".