261121303 has 4 divisors (see below), whose sum is σ = 261297000. Its totient is φ = 260945608.

The previous prime is 261121291. The next prime is 261121337. The reversal of 261121303 is 303121162.

261121303 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-261121303 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261121363) 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, 85600 + ... + 88597.

It is an arithmetic number, because the mean of its divisors is an integer number (65324250).

Almost surely, 2^261121303 is an apocalyptic number.

261121303 is a deficient number, since it is larger than the sum of its proper divisors (175697).

261121303 is a wasteful number, since it uses less digits than its factorization.

261121303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175696.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 261121303 is about 16159.2482188993. The cubic root of 261121303 is about 639.1666423891.

Adding to 261121303 its reverse (303121162), we get a palindrome (564242465).

The spelling of 261121303 in words is "two hundred sixty-one million, one hundred twenty-one thousand, three hundred three".