91023487 has 4 divisors (see below), whose sum is σ = 91347696. Its totient is φ = 90699280.

The previous prime is 91023479. The next prime is 91023503. The reversal of 91023487 is 78432019.

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 91023487 - 2³ = 91023479 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 (91023467) 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, 161683 + ... + 162244.

It is an arithmetic number, because the mean of its divisors is an integer number (22836924).

Almost surely, 2^91023487 is an apocalyptic number.

91023487 is a deficient number, since it is larger than the sum of its proper divisors (324209).

91023487 is a wasteful number, since it uses less digits than its factorization.

91023487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324208.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 91023487 is about 9540.6229880443. The cubic root of 91023487 is about 449.8328383236.

The spelling of 91023487 in words is "ninety-one million, twenty-three thousand, four hundred eighty-seven".