91387883 has 4 divisors (see below), whose sum is σ = 92275248. Its totient is φ = 90500520.

The previous prime is 91387867. The next prime is 91387921. The reversal of 91387883 is 38878319.

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 91387883 - 2⁴ = 91387867 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91387843) 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, 443528 + ... + 443733.

It is an arithmetic number, because the mean of its divisors is an integer number (23068812).

Almost surely, 2^91387883 is an apocalyptic number.

91387883 is a deficient number, since it is larger than the sum of its proper divisors (887365).

91387883 is a wasteful number, since it uses less digits than its factorization.

91387883 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 887364.

The product of its digits is 290304, while the sum is 47.

The square root of 91387883 is about 9559.7009890477. The cubic root of 91387883 is about 450.4323137625.

The spelling of 91387883 in words is "ninety-one million, three hundred eighty-seven thousand, eight hundred eighty-three".