3561279521 has 2 divisors, whose sum is σ = 3561279522. Its totient is φ = 3561279520.

The previous prime is 3561279499. The next prime is 3561279539. The reversal of 3561279521 is 1259721653.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3438180496 + 123099025 = 58636^2 + 11095^2 .

It is a cyclic number.

It is not a de Polignac number, because 3561279521 - 2¹⁸ = 3561017377 is a prime.

It is not a weakly prime, because it can be changed into another prime (3561279551) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1780639760 + 1780639761.

It is an arithmetic number, because the mean of its divisors is an integer number (1780639761).

Almost surely, 2^3561279521 is an apocalyptic number.

It is an amenable number.

3561279521 is a deficient number, since it is larger than the sum of its proper divisors (1).

3561279521 is an equidigital number, since it uses as much as digits as its factorization.

3561279521 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 113400, while the sum is 41.

The square root of 3561279521 is about 59676.4570077681. The cubic root of 3561279521 is about 1527.1042557128.

The spelling of 3561279521 in words is "three billion, five hundred sixty-one million, two hundred seventy-nine thousand, five hundred twenty-one".