91403121 has 4 divisors (see below), whose sum is σ = 121870832. Its totient is φ = 60935412.

The previous prime is 91403119. The next prime is 91403131. The reversal of 91403121 is 12130419.

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 not a de Polignac number, because 91403121 - 2¹ = 91403119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91403131) 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, 15233851 + ... + 15233856.

It is an arithmetic number, because the mean of its divisors is an integer number (30467708).

Almost surely, 2^91403121 is an apocalyptic number.

It is an amenable number.

91403121 is a deficient number, since it is larger than the sum of its proper divisors (30467711).

91403121 is a wasteful number, since it uses less digits than its factorization.

91403121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30467710.

The product of its (nonzero) digits is 216, while the sum is 21.

The square root of 91403121 is about 9560.4979472829. The cubic root of 91403121 is about 450.4573473735.

The spelling of 91403121 in words is "ninety-one million, four hundred three thousand, one hundred twenty-one".