1721920283 has 2 divisors, whose sum is σ = 1721920284. Its totient is φ = 1721920282.

The previous prime is 1721920279. The next prime is 1721920307. The reversal of 1721920283 is 3820291271.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1721920283 - 2² = 1721920279 is a prime.

It is a super-2 number, since 2×1721920283² = 5930018922013600178, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1721922283) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 860960141 + 860960142.

It is an arithmetic number, because the mean of its divisors is an integer number (860960142).

Almost surely, 2^1721920283 is an apocalyptic number.

1721920283 is a deficient number, since it is larger than the sum of its proper divisors (1).

1721920283 is an equidigital number, since it uses as much as digits as its factorization.

1721920283 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 1721920283 is about 41496.0273158769. The cubic root of 1721920283 is about 1198.5910043588.

The spelling of 1721920283 in words is "one billion, seven hundred twenty-one million, nine hundred twenty thousand, two hundred eighty-three".