261517367 has 2 divisors, whose sum is σ = 261517368. Its totient is φ = 261517366.

The previous prime is 261517327. The next prime is 261517397. The reversal of 261517367 is 763715162.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 261517367 - 2⁸ = 261517111 is a prime.

It is a super-2 number, since 2×261517367² = 136782666485225378, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 261517367.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (261517327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130758683 + 130758684.

It is an arithmetic number, because the mean of its divisors is an integer number (130758684).

Almost surely, 2^261517367 is an apocalyptic number.

261517367 is a deficient number, since it is larger than the sum of its proper divisors (1).

261517367 is an equidigital number, since it uses as much as digits as its factorization.

261517367 is an evil number, because the sum of its binary digits is even.

The product of its digits is 52920, while the sum is 38.

The square root of 261517367 is about 16171.4986009337. The cubic root of 261517367 is about 639.4896378837.

The spelling of 261517367 in words is "two hundred sixty-one million, five hundred seventeen thousand, three hundred sixty-seven".