505321387 has 2 divisors, whose sum is σ = 505321388. Its totient is φ = 505321386.

The previous prime is 505321381. The next prime is 505321417. The reversal of 505321387 is 783123505.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-505321387 is a prime.

It is not a weakly prime, because it can be changed into another prime (505321381) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 252660693 + 252660694.

It is an arithmetic number, because the mean of its divisors is an integer number (252660694).

Almost surely, 2^505321387 is an apocalyptic number.

505321387 is a deficient number, since it is larger than the sum of its proper divisors (1).

505321387 is an equidigital number, since it uses as much as digits as its factorization.

505321387 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 25200, while the sum is 34.

The square root of 505321387 is about 22479.3546837982. The cubic root of 505321387 is about 796.5063206953.

The spelling of 505321387 in words is "five hundred five million, three hundred twenty-one thousand, three hundred eighty-seven".