261717425 has 6 divisors (see below), whose sum is σ = 324529638. Its totient is φ = 209373920.

The previous prime is 261717403. The next prime is 261717427. The reversal of 261717425 is 524717162.

It can be written as a sum of positive squares in 3 ways, for example, as 32982049 + 228735376 = 5743^2 + 15124^2 .

It is not a de Polignac number, because 261717425 - 2¹⁰ = 261716401 is a prime.

It is a super-3 number, since 3×261717425³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261717427) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5234324 + ... + 5234373.

It is an arithmetic number, because the mean of its divisors is an integer number (54088273).

Almost surely, 2^261717425 is an apocalyptic number.

261717425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

261717425 is a deficient number, since it is larger than the sum of its proper divisors (62812213).

261717425 is a wasteful number, since it uses less digits than its factorization.

261717425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10468707 (or 10468702 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 261717425 is about 16177.6829305065. The cubic root of 261717425 is about 639.6526639067.

The spelling of 261717425 in words is "two hundred sixty-one million, seven hundred seventeen thousand, four hundred twenty-five".