260817391 has 2 divisors, whose sum is σ = 260817392. Its totient is φ = 260817390.

The previous prime is 260817377. The next prime is 260817439. The reversal of 260817391 is 193718062.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 260817391 - 2²¹ = 258720239 is a prime.

It is a super-2 number, since 2×260817391² = 136051422896093762, 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 260817391.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (260817301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130408695 + 130408696.

It is an arithmetic number, because the mean of its divisors is an integer number (130408696).

Almost surely, 2^260817391 is an apocalyptic number.

260817391 is a deficient number, since it is larger than the sum of its proper divisors (1).

260817391 is an equidigital number, since it uses as much as digits as its factorization.

260817391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 37.

The square root of 260817391 is about 16149.8418258508. The cubic root of 260817391 is about 638.9185765539.

The spelling of 260817391 in words is "two hundred sixty million, eight hundred seventeen thousand, three hundred ninety-one".