3531720109 has 2 divisors, whose sum is σ = 3531720110. Its totient is φ = 3531720108.

The previous prime is 3531720103. The next prime is 3531720113. The reversal of 3531720109 is 9010271353.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1785316009 + 1746404100 = 42253^2 + 41790^2 .

It is a cyclic number.

It is not a de Polignac number, because 3531720109 - 2⁵ = 3531720077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3531720103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1765860054 + 1765860055.

It is an arithmetic number, because the mean of its divisors is an integer number (1765860055).

Almost surely, 2^3531720109 is an apocalyptic number.

It is an amenable number.

3531720109 is a deficient number, since it is larger than the sum of its proper divisors (1).

3531720109 is an equidigital number, since it uses as much as digits as its factorization.

3531720109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5670, while the sum is 31.

The square root of 3531720109 is about 59428.2770152391. The cubic root of 3531720109 is about 1522.8674101048.

The spelling of 3531720109 in words is "three billion, five hundred thirty-one million, seven hundred twenty thousand, one hundred nine".