91393901 has 4 divisors (see below), whose sum is σ = 91657632. Its totient is φ = 91130172.

The previous prime is 91393871. The next prime is 91393903. The reversal of 91393901 is 10939319.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91393901 - 2⁶ = 91393837 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 (91393903) 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, 131345 + ... + 132038.

It is an arithmetic number, because the mean of its divisors is an integer number (22914408).

Almost surely, 2^91393901 is an apocalyptic number.

It is an amenable number.

91393901 is a deficient number, since it is larger than the sum of its proper divisors (263731).

91393901 is a wasteful number, since it uses less digits than its factorization.

91393901 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263730.

The product of its (nonzero) digits is 6561, while the sum is 35.

The square root of 91393901 is about 9560.0157426649. The cubic root of 91393901 is about 450.4422007120.

The spelling of 91393901 in words is "ninety-one million, three hundred ninety-three thousand, nine hundred one".