261404503 has 2 divisors, whose sum is σ = 261404504. Its totient is φ = 261404502.

The previous prime is 261404501. The next prime is 261404513. The reversal of 261404503 is 305404162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261404503 - 2¹ = 261404501 is a prime.

Together with 261404501, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261404501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130702251 + 130702252.

It is an arithmetic number, because the mean of its divisors is an integer number (130702252).

Almost surely, 2^261404503 is an apocalyptic number.

261404503 is a deficient number, since it is larger than the sum of its proper divisors (1).

261404503 is an equidigital number, since it uses as much as digits as its factorization.

261404503 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 261404503 is about 16168.0086281521. The cubic root of 261404503 is about 639.3976290243.

Adding to 261404503 its reverse (305404162), we get a palindrome (566808665).

The spelling of 261404503 in words is "two hundred sixty-one million, four hundred four thousand, five hundred three".