261172417 has 8 divisors (see below), whose sum is σ = 285035040. Its totient is φ = 237329760.

The previous prime is 261172399. The next prime is 261172421. The reversal of 261172417 is 714271162.

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 261172417 - 2¹⁵ = 261139649 is a prime.

It is a super-2 number, since 2×261172417² = 136422062803243778, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261172447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40198 + ... + 46240.

It is an arithmetic number, because the mean of its divisors is an integer number (35629380).

Almost surely, 2^261172417 is an apocalyptic number.

It is an amenable number.

261172417 is a deficient number, since it is larger than the sum of its proper divisors (23862623).

261172417 is a wasteful number, since it uses less digits than its factorization.

261172417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9983.

The product of its digits is 4704, while the sum is 31.

The square root of 261172417 is about 16160.8297126107. The cubic root of 261172417 is about 639.2083448876.

The spelling of 261172417 in words is "two hundred sixty-one million, one hundred seventy-two thousand, four hundred seventeen".