261198369 has 12 divisors (see below), whose sum is σ = 383682000. Its totient is φ = 171180504.

The previous prime is 261198367. The next prime is 261198403. The reversal of 261198369 is 963891162.

It is a happy number.

It is not a de Polignac number, because 261198369 - 2¹ = 261198367 is a prime.

It is a super-2 number, since 2×261198369² = 136449175936520322, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (261198367) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 245419 + ... + 246480.

It is an arithmetic number, because the mean of its divisors is an integer number (31973500).

Almost surely, 2^261198369 is an apocalyptic number.

It is an amenable number.

261198369 is a deficient number, since it is larger than the sum of its proper divisors (122483631).

261198369 is a wasteful number, since it uses less digits than its factorization.

261198369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 491964 (or 491961 counting only the distinct ones).

The product of its digits is 139968, while the sum is 45.

The square root of 261198369 is about 16161.6326217372. The cubic root of 261198369 is about 639.2295163239.

The spelling of 261198369 in words is "two hundred sixty-one million, one hundred ninety-eight thousand, three hundred sixty-nine".