260001391 has 4 divisors (see below), whose sum is σ = 280001512. Its totient is φ = 240001272.

The previous prime is 260001373. The next prime is 260001397. The reversal of 260001391 is 193100062.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 193100062 = 2 ⋅96550031.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-260001391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (260001397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10000041 + ... + 10000066.

It is an arithmetic number, because the mean of its divisors is an integer number (70000378).

Almost surely, 2^260001391 is an apocalyptic number.

260001391 is a deficient number, since it is larger than the sum of its proper divisors (20000121).

260001391 is a wasteful number, since it uses less digits than its factorization.

260001391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20000120.

The product of its (nonzero) digits is 324, while the sum is 22.

The square root of 260001391 is about 16124.5586296184. The cubic root of 260001391 is about 638.2515680972.

The spelling of 260001391 in words is "two hundred sixty million, one thousand, three hundred ninety-one".