1721487407 has 2 divisors, whose sum is σ = 1721487408. Its totient is φ = 1721487406.

The previous prime is 1721487403. The next prime is 1721487409. The reversal of 1721487407 is 7047841271.

It is a strong prime.

It is an emirp because it is prime and its reverse (7047841271) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1721487407 - 2² = 1721487403 is a prime.

Together with 1721487409, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721487401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860743703 + 860743704.

It is an arithmetic number, because the mean of its divisors is an integer number (860743704).

Almost surely, 2^1721487407 is an apocalyptic number.

1721487407 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721487407 is an equidigital number, since it uses as much as digits as its factorization.

1721487407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 87808, while the sum is 41.

The square root of 1721487407 is about 41490.8111152337. The cubic root of 1721487407 is about 1198.4905574395.

The spelling of 1721487407 in words is "one billion, seven hundred twenty-one million, four hundred eighty-seven thousand, four hundred seven".