260291387 has 2 divisors, whose sum is σ = 260291388. Its totient is φ = 260291386.

The previous prime is 260291371. The next prime is 260291389. The reversal of 260291387 is 783192062.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 260291387 - 2⁴ = 260291371 is a prime.

It is a super-2 number, since 2×260291387² = 135503212292767538, which contains 22 as substring.

Together with 260291389, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 260291387.

It is not a weakly prime, because it can be changed into another prime (260291389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 130145693 + 130145694.

It is an arithmetic number, because the mean of its divisors is an integer number (130145694).

Almost surely, 2^260291387 is an apocalyptic number.

260291387 is a deficient number, since it is larger than the sum of its proper divisors (1).

260291387 is an equidigital number, since it uses as much as digits as its factorization.

260291387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 260291387 is about 16133.5484937443. The cubic root of 260291387 is about 638.4887740461.

The spelling of 260291387 in words is "two hundred sixty million, two hundred ninety-one thousand, three hundred eighty-seven".