1721120543 has 2 divisors, whose sum is σ = 1721120544. Its totient is φ = 1721120542.

The previous prime is 1721120503. The next prime is 1721120587. The reversal of 1721120543 is 3450211271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721120543 - 2²⁰ = 1720071967 is a prime.

It is a super-2 number, since 2×1721120543² = 5924511847073229698, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1721120503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860560271 + 860560272.

It is an arithmetic number, because the mean of its divisors is an integer number (860560272).

Almost surely, 2^1721120543 is an apocalyptic number.

1721120543 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721120543 is an equidigital number, since it uses as much as digits as its factorization.

1721120543 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 1721120543 is about 41486.3898525770. The cubic root of 1721120543 is about 1198.4054151230.

The spelling of 1721120543 in words is "one billion, seven hundred twenty-one million, one hundred twenty thousand, five hundred forty-three".