91874909 has 4 divisors (see below), whose sum is σ = 104999904. Its totient is φ = 78749916.

The previous prime is 91874879. The next prime is 91874911. The reversal of 91874909 is 90947819.

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, and also an emirpimes, since its reverse is a distinct semiprime: 90947819 = 23 ⋅3954253.

It is not a de Polignac number, because 91874909 - 2¹² = 91870813 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 (91874999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6562487 + ... + 6562500.

It is an arithmetic number, because the mean of its divisors is an integer number (26249976).

Almost surely, 2^91874909 is an apocalyptic number.

It is an amenable number.

91874909 is a deficient number, since it is larger than the sum of its proper divisors (13124995).

91874909 is a wasteful number, since it uses less digits than its factorization.

91874909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13124994.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 91874909 is about 9585.1400094104. The cubic root of 91874909 is about 451.2310473083.

The spelling of 91874909 in words is "ninety-one million, eight hundred seventy-four thousand, nine hundred nine".