261088403 has 2 divisors, whose sum is σ = 261088404. Its totient is φ = 261088402.

The previous prime is 261088351. The next prime is 261088423. The reversal of 261088403 is 304880162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261088403 - 2⁶ = 261088339 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261088403.

It is not a weakly prime, because it can be changed into another prime (261088423) 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 as a sum of consecutive naturals, namely, 130544201 + 130544202.

It is an arithmetic number, because the mean of its divisors is an integer number (130544202).

Almost surely, 2^261088403 is an apocalyptic number.

261088403 is a deficient number, since it is larger than the sum of its proper divisors (1).

261088403 is an equidigital number, since it uses as much as digits as its factorization.

261088403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 261088403 is about 16158.2301939290. The cubic root of 261088403 is about 639.1397973104.

The spelling of 261088403 in words is "two hundred sixty-one million, eighty-eight thousand, four hundred three".