261198403 has 2 divisors, whose sum is σ = 261198404. Its totient is φ = 261198402.

The previous prime is 261198367. The next prime is 261198407. The reversal of 261198403 is 304891162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261198403 - 2²¹ = 259101251 is a prime.

It is not a weakly prime, because it can be changed into another prime (261198407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130599201 + 130599202.

It is an arithmetic number, because the mean of its divisors is an integer number (130599202).

Almost surely, 2^261198403 is an apocalyptic number.

261198403 is a deficient number, since it is larger than the sum of its proper divisors (1).

261198403 is an equidigital number, since it uses as much as digits as its factorization.

261198403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 261198403 is about 16161.6336736111. The cubic root of 261198403 is about 639.2295440599.

The spelling of 261198403 in words is "two hundred sixty-one million, one hundred ninety-eight thousand, four hundred three".