7861546409 has 2 divisors, whose sum is σ = 7861546410. Its totient is φ = 7861546408.

The previous prime is 7861546367. The next prime is 7861546421. The reversal of 7861546409 is 9046451687.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7740480400 + 121066009 = 87980^2 + 11003^2 .

It is a cyclic number.

It is not a de Polignac number, because 7861546409 - 2¹² = 7861542313 is a prime.

It is not a weakly prime, because it can be changed into another prime (7861546489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3930773204 + 3930773205.

It is an arithmetic number, because the mean of its divisors is an integer number (3930773205).

Almost surely, 2^7861546409 is an apocalyptic number.

It is an amenable number.

7861546409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7861546409 is an equidigital number, since it uses as much as digits as its factorization.

7861546409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 7861546409 is about 88665.3619459144. The cubic root of 7861546409 is about 1988.3949928983.

The spelling of 7861546409 in words is "seven billion, eight hundred sixty-one million, five hundred forty-six thousand, four hundred nine".