27906031609 has 2 divisors, whose sum is σ = 27906031610. Its totient is φ = 27906031608.

The previous prime is 27906031499. The next prime is 27906031619. The reversal of 27906031609 is 90613060972.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24703037584 + 3202994025 = 157172^2 + 56595^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-27906031609 is a prime.

It is not a weakly prime, because it can be changed into another prime (27906031619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 13953015804 + 13953015805.

It is an arithmetic number, because the mean of its divisors is an integer number (13953015805).

Almost surely, 2^27906031609 is an apocalyptic number.

It is an amenable number.

27906031609 is a deficient number, since it is larger than the sum of its proper divisors (1).

27906031609 is an equidigital number, since it uses as much as digits as its factorization.

27906031609 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 43.

The spelling of 27906031609 in words is "twenty-seven billion, nine hundred six million, thirty-one thousand, six hundred nine".