261995093 has 8 divisors (see below), whose sum is σ = 273672000. Its totient is φ = 250342048.

The previous prime is 261995053. The next prime is 261995099. The reversal of 261995093 is 390599162.

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 261995093 - 2¹⁰ = 261994069 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 (261995099) 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, 18698 + ... + 29556.

It is an arithmetic number, because the mean of its divisors is an integer number (34209000).

Almost surely, 2^261995093 is an apocalyptic number.

261995093 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

261995093 is a deficient number, since it is larger than the sum of its proper divisors (11676907).

261995093 is a wasteful number, since it uses less digits than its factorization.

261995093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11931.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 261995093 is about 16186.2624777927. The cubic root of 261995093 is about 639.8787962209.

The spelling of 261995093 in words is "two hundred sixty-one million, nine hundred ninety-five thousand, ninety-three".