91916487 has 24 divisors (see below), whose sum is σ = 149202144. Its totient is φ = 54103104.

The previous prime is 91916477. The next prime is 91916507. The reversal of 91916487 is 78461919.

It is a happy number.

It is not a de Polignac number, because 91916487 - 2¹⁰ = 91915463 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91916477) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 14388 + ... + 19769.

It is an arithmetic number, because the mean of its divisors is an integer number (6216756).

Almost surely, 2^91916487 is an apocalyptic number.

91916487 is a deficient number, since it is larger than the sum of its proper divisors (57285657).

91916487 is a wasteful number, since it uses less digits than its factorization.

91916487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34199 (or 34196 counting only the distinct ones).

The product of its digits is 108864, while the sum is 45.

The square root of 91916487 is about 9587.3086421581. The cubic root of 91916487 is about 451.2991052625.

The spelling of 91916487 in words is "ninety-one million, nine hundred sixteen thousand, four hundred eighty-seven".