261003427 has 4 divisors (see below), whose sum is σ = 261714976. Its totient is φ = 260291880.

The previous prime is 261003409. The next prime is 261003481. The reversal of 261003427 is 724300162.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 261003427 - 2¹¹ = 261001379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261003487) 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, 355224 + ... + 355957.

It is an arithmetic number, because the mean of its divisors is an integer number (65428744).

Almost surely, 2^261003427 is an apocalyptic number.

261003427 is a deficient number, since it is larger than the sum of its proper divisors (711549).

261003427 is an equidigital number, since it uses as much as digits as its factorization.

261003427 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 711548.

The product of its (nonzero) digits is 2016, while the sum is 25.

The square root of 261003427 is about 16155.6004840427. The cubic root of 261003427 is about 639.0704498709.

Adding to 261003427 its reverse (724300162), we get a palindrome (985303589).

The spelling of 261003427 in words is "two hundred sixty-one million, three thousand, four hundred twenty-seven".