3504221561 has 2 divisors, whose sum is σ = 3504221562. Its totient is φ = 3504221560.

The previous prime is 3504221551. The next prime is 3504221663. The reversal of 3504221561 is 1651224053.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2103965161 + 1400256400 = 45869^2 + 37420^2 .

It is a cyclic number.

It is not a de Polignac number, because 3504221561 - 2²² = 3500027257 is a prime.

It is not a weakly prime, because it can be changed into another prime (3504221521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1752110780 + 1752110781.

It is an arithmetic number, because the mean of its divisors is an integer number (1752110781).

Almost surely, 2^3504221561 is an apocalyptic number.

It is an amenable number.

3504221561 is a deficient number, since it is larger than the sum of its proper divisors (1).

3504221561 is an equidigital number, since it uses as much as digits as its factorization.

3504221561 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 3504221561 is about 59196.4657813285. The cubic root of 3504221561 is about 1518.9046761781.

The spelling of 3504221561 in words is "three billion, five hundred four million, two hundred twenty-one thousand, five hundred sixty-one".