261022603 has 4 divisors (see below), whose sum is σ = 261060120. Its totient is φ = 260985088.

The previous prime is 261022579. The next prime is 261022621. The reversal of 261022603 is 306220162.

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 261022603 - 2⁵ = 261022571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261022103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4918 + ... + 23371.

It is an arithmetic number, because the mean of its divisors is an integer number (65265030).

Almost surely, 2^261022603 is an apocalyptic number.

261022603 is a deficient number, since it is larger than the sum of its proper divisors (37517).

261022603 is an equidigital number, since it uses as much as digits as its factorization.

261022603 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37516.

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

The square root of 261022603 is about 16156.1939515469. The cubic root of 261022603 is about 639.0861003868.

Adding to 261022603 its reverse (306220162), we get a palindrome (567242765).

The spelling of 261022603 in words is "two hundred sixty-one million, twenty-two thousand, six hundred three".