91378403 has 4 divisors (see below), whose sum is σ = 91811688. Its totient is φ = 90945120.

The previous prime is 91378373. The next prime is 91378409. The reversal of 91378403 is 30487319.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 91378403 - 2¹⁶ = 91312867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91378409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 216326 + ... + 216747.

It is an arithmetic number, because the mean of its divisors is an integer number (22952922).

Almost surely, 2^91378403 is an apocalyptic number.

91378403 is a deficient number, since it is larger than the sum of its proper divisors (433285).

91378403 is a wasteful number, since it uses less digits than its factorization.

91378403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433284.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 91378403 is about 9559.2051447806. The cubic root of 91378403 is about 450.4167382257.

The spelling of 91378403 in words is "ninety-one million, three hundred seventy-eight thousand, four hundred three".