261123195 has 8 divisors (see below), whose sum is σ = 417797136. Its totient is φ = 139265696.

The previous prime is 261123193. The next prime is 261123197. The reversal of 261123195 is 591321162.

It is an interprime number because it is at equal distance from previous prime (261123193) and next prime (261123197).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261123195 - 2¹ = 261123193 is a prime.

It is not an unprimeable number, because it can be changed into a prime (261123193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8704092 + ... + 8704121.

It is an arithmetic number, because the mean of its divisors is an integer number (52224642).

Almost surely, 2^261123195 is an apocalyptic number.

261123195 is a deficient number, since it is larger than the sum of its proper divisors (156673941).

261123195 is a wasteful number, since it uses less digits than its factorization.

261123195 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17408221.

The product of its digits is 3240, while the sum is 30.

The square root of 261123195 is about 16159.3067611207. The cubic root of 261123195 is about 639.1681861166.

The spelling of 261123195 in words is "two hundred sixty-one million, one hundred twenty-three thousand, one hundred ninety-five".