687352481 has 2 divisors, whose sum is σ = 687352482. Its totient is φ = 687352480.

The previous prime is 687352459. The next prime is 687352489. The reversal of 687352481 is 184253786.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 546811456 + 140541025 = 23384^2 + 11855^2 .

It is a cyclic number.

It is not a de Polignac number, because 687352481 - 2¹⁸ = 687090337 is a prime.

It is a super-2 number, since 2×687352481² = 944906866273710722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (687352489) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 343676240 + 343676241.

It is an arithmetic number, because the mean of its divisors is an integer number (343676241).

Almost surely, 2^687352481 is an apocalyptic number.

It is an amenable number.

687352481 is a deficient number, since it is larger than the sum of its proper divisors (1).

687352481 is an equidigital number, since it uses as much as digits as its factorization.

687352481 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 322560, while the sum is 44.

The square root of 687352481 is about 26217.4079763809. The cubic root of 687352481 is about 882.5239528364.

The spelling of 687352481 in words is "six hundred eighty-seven million, three hundred fifty-two thousand, four hundred eighty-one".