1391332716909 has 32 divisors (see below), whose sum is σ = 2072866090880. Its totient is φ = 922328467200.

The previous prime is 1391332716841. The next prime is 1391332716913. The reversal of 1391332716909 is 9096172331931.

It is a happy number.

It is not a de Polignac number, because 1391332716909 - 2²⁰ = 1391331668333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1391332712909) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6254229 + ... + 6472869.

It is an arithmetic number, because the mean of its divisors is an integer number (64777065340).

Almost surely, 2^{1391332716909} is an apocalyptic number.

It is an amenable number.

1391332716909 is a deficient number, since it is larger than the sum of its proper divisors (681533373971).

1391332716909 is a wasteful number, since it uses less digits than its factorization.

1391332716909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219978 (or 219972 counting only the distinct ones).

The product of its (nonzero) digits is 1653372, while the sum is 54.

The spelling of 1391332716909 in words is "one trillion, three hundred ninety-one billion, three hundred thirty-two million, seven hundred sixteen thousand, nine hundred nine".