1721120587 has 2 divisors, whose sum is σ = 1721120588. Its totient is φ = 1721120586.

The previous prime is 1721120543. The next prime is 1721120593. The reversal of 1721120587 is 7850211271.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1721120587 is a prime.

It is not a weakly prime, because it can be changed into another prime (1721120087) 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, 860560293 + 860560294.

It is an arithmetic number, because the mean of its divisors is an integer number (860560294).

Almost surely, 2^1721120587 is an apocalyptic number.

1721120587 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721120587 is an equidigital number, since it uses as much as digits as its factorization.

1721120587 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 7840, while the sum is 34.

The square root of 1721120587 is about 41486.3903828713. The cubic root of 1721120587 is about 1198.4054253353.

The spelling of 1721120587 in words is "one billion, seven hundred twenty-one million, one hundred twenty thousand, five hundred eighty-seven".