261562189 has 24 divisors (see below), whose sum is σ = 319308480. Its totient is φ = 209829312.

The previous prime is 261562109. The next prime is 261562193. The reversal of 261562189 is 981265162.

It is not a de Polignac number, because 261562189 - 2¹⁹ = 261037901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261562109) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 224322 + ... + 225484.

It is an arithmetic number, because the mean of its divisors is an integer number (13304520).

Almost surely, 2^261562189 is an apocalyptic number.

It is an amenable number.

261562189 is a deficient number, since it is larger than the sum of its proper divisors (57746291).

261562189 is a wasteful number, since it uses less digits than its factorization.

261562189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1297 (or 1278 counting only the distinct ones).

The product of its digits is 51840, while the sum is 40.

The square root of 261562189 is about 16172.8843747799. The cubic root of 261562189 is about 639.5261702786.

The spelling of 261562189 in words is "two hundred sixty-one million, five hundred sixty-two thousand, one hundred eighty-nine".