261198367 has 2 divisors, whose sum is σ = 261198368. Its totient is φ = 261198366.

The previous prime is 261198349. The next prime is 261198403. The reversal of 261198367 is 763891162.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 261198367 - 2⁷ = 261198239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261198667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130599183 + 130599184.

It is an arithmetic number, because the mean of its divisors is an integer number (130599184).

Almost surely, 2^261198367 is an apocalyptic number.

261198367 is a deficient number, since it is larger than the sum of its proper divisors (1).

261198367 is an equidigital number, since it uses as much as digits as its factorization.

261198367 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 43.

The square root of 261198367 is about 16161.6325598623. The cubic root of 261198367 is about 639.2295146924.

The spelling of 261198367 in words is "two hundred sixty-one million, one hundred ninety-eight thousand, three hundred sixty-seven".