11387531009 has 2 divisors, whose sum is σ = 11387531010. Its totient is φ = 11387531008.

The previous prime is 11387530993. The next prime is 11387531021. The reversal of 11387531009 is 90013578311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 9148348609 + 2239182400 = 95647^2 + 47320^2 .

It is an emirp because it is prime and its reverse (90013578311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11387531009 - 2⁴ = 11387530993 is a prime.

It is not a weakly prime, because it can be changed into another prime (11387531509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5693765504 + 5693765505.

It is an arithmetic number, because the mean of its divisors is an integer number (5693765505).

Almost surely, 2^11387531009 is an apocalyptic number.

It is an amenable number.

11387531009 is a deficient number, since it is larger than the sum of its proper divisors (1).

11387531009 is an equidigital number, since it uses as much as digits as its factorization.

11387531009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 38.

The spelling of 11387531009 in words is "eleven billion, three hundred eighty-seven million, five hundred thirty-one thousand, nine".