391266052487 has 2 divisors, whose sum is σ = 391266052488. Its totient is φ = 391266052486.

The previous prime is 391266052483. The next prime is 391266052501. The reversal of 391266052487 is 784250662193.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 391266052487 - 2² = 391266052483 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (391266052481) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195633026243 + 195633026244.

It is an arithmetic number, because the mean of its divisors is an integer number (195633026244).

It is a 1-persistent number, because it is pandigital, but 2⋅391266052487 = 782532104974 is not.

Almost surely, 2^391266052487 is an apocalyptic number.

391266052487 is a deficient number, since it is larger than the sum of its proper divisors (1).

391266052487 is an equidigital number, since it uses as much as digits as its factorization.

391266052487 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4354560, while the sum is 53.

The spelling of 391266052487 in words is "three hundred ninety-one billion, two hundred sixty-six million, fifty-two thousand, four hundred eighty-seven".