91396409 has 8 divisors (see below), whose sum is σ = 98526792. Its totient is φ = 84280320.

The previous prime is 91396397. The next prime is 91396423. The reversal of 91396409 is 90469319.

It can be written as a sum of positive squares in 4 ways, for example, as 861184 + 90535225 = 928^2 + 9515^2 .

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-91396409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91396499) 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, 12377 + ... + 18329.

It is an arithmetic number, because the mean of its divisors is an integer number (12315849).

Almost surely, 2^91396409 is an apocalyptic number.

It is an amenable number.

91396409 is a deficient number, since it is larger than the sum of its proper divisors (7130383).

91396409 is a wasteful number, since it uses less digits than its factorization.

91396409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147.

The product of its (nonzero) digits is 52488, while the sum is 41.

The square root of 91396409 is about 9560.1469130971. The cubic root of 91396409 is about 450.4463209676.

The spelling of 91396409 in words is "ninety-one million, three hundred ninety-six thousand, four hundred nine".