261117741 has 16 divisors (see below), whose sum is σ = 368072640. Its totient is φ = 164200320.

The previous prime is 261117737. The next prime is 261117757. The reversal of 261117741 is 147711162.

It is not a de Polignac number, because 261117741 - 2² = 261117737 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 261117699 and 261117708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261117761) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3451 + ... + 23111.

It is an arithmetic number, because the mean of its divisors is an integer number (23004540).

Almost surely, 2^261117741 is an apocalyptic number.

It is an amenable number.

261117741 is a deficient number, since it is larger than the sum of its proper divisors (106954899).

261117741 is a wasteful number, since it uses less digits than its factorization.

261117741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19916.

The product of its digits is 2352, while the sum is 30.

The square root of 261117741 is about 16159.1380030000. The cubic root of 261117741 is about 639.1637360490.

The spelling of 261117741 in words is "two hundred sixty-one million, one hundred seventeen thousand, seven hundred forty-one".