3551509645391 has 2 divisors, whose sum is σ = 3551509645392. Its totient is φ = 3551509645390.

The previous prime is 3551509645363. The next prime is 3551509645429. The reversal of 3551509645391 is 1935469051553.

3551509645391 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3551509645391 - 2¹⁰ = 3551509644367 is a prime.

It is a super-2 number, since 2×3551509645391² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3551509645291) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1775754822695 + 1775754822696.

It is an arithmetic number, because the mean of its divisors is an integer number (1775754822696).

Almost surely, 2^{3551509645391} is an apocalyptic number.

3551509645391 is a deficient number, since it is larger than the sum of its proper divisors (1).

3551509645391 is an equidigital number, since it uses as much as digits as its factorization.

3551509645391 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10935000, while the sum is 56.

The spelling of 3551509645391 in words is "three trillion, five hundred fifty-one billion, five hundred nine million, six hundred forty-five thousand, three hundred ninety-one".