261003403 has 2 divisors, whose sum is σ = 261003404. Its totient is φ = 261003402.

The previous prime is 261003401. The next prime is 261003409. The reversal of 261003403 is 304300162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261003403 - 2¹ = 261003401 is a prime.

Together with 261003401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (261003401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130501701 + 130501702.

It is an arithmetic number, because the mean of its divisors is an integer number (130501702).

Almost surely, 2^261003403 is an apocalyptic number.

261003403 is a deficient number, since it is larger than the sum of its proper divisors (1).

261003403 is an equidigital number, since it uses as much as digits as its factorization.

261003403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 19.

The square root of 261003403 is about 16155.5997412662. The cubic root of 261003403 is about 639.0704302828.

Adding to 261003403 its reverse (304300162), we get a palindrome (565303565).

The spelling of 261003403 in words is "two hundred sixty-one million, three thousand, four hundred three".