91368478409 has 8 divisors (see below), whose sum is σ = 104184871560. Its totient is φ = 79378949376.

The previous prime is 91368478387. The next prime is 91368478417. The reversal of 91368478409 is 90487486319.

It can be written as a sum of positive squares in 4 ways, for example, as 1216614400 + 90151864009 = 34880^2 + 300253^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-91368478409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91368478429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 206715794 + ... + 206716235.

It is an arithmetic number, because the mean of its divisors is an integer number (13023108945).

Almost surely, 2^91368478409 is an apocalyptic number.

It is an amenable number.

91368478409 is a deficient number, since it is larger than the sum of its proper divisors (12816393151).

91368478409 is a wasteful number, since it uses less digits than its factorization.

91368478409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413432059.

The product of its (nonzero) digits is 10450944, while the sum is 59.

The spelling of 91368478409 in words is "ninety-one billion, three hundred sixty-eight million, four hundred seventy-eight thousand, four hundred nine".