261263203 has 4 divisors (see below), whose sum is σ = 261316600. Its totient is φ = 261209808.

The previous prime is 261263161. The next prime is 261263207. The reversal of 261263203 is 302362162.

It is a happy number.

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 261263203 - 2⁹ = 261262691 is a prime.

It is a super-2 number, since 2×261263203² = 136516922483638418, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261263207) 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, 18525 + ... + 29422.

It is an arithmetic number, because the mean of its divisors is an integer number (65329150).

Almost surely, 2^261263203 is an apocalyptic number.

261263203 is a deficient number, since it is larger than the sum of its proper divisors (53397).

261263203 is an equidigital number, since it uses as much as digits as its factorization.

261263203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53396.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 261263203 is about 16163.6382971162. The cubic root of 261263203 is about 639.2824012610.

The spelling of 261263203 in words is "two hundred sixty-one million, two hundred sixty-three thousand, two hundred three".