91620503 has 4 divisors (see below), whose sum is σ = 98668248. Its totient is φ = 84572760.

The previous prime is 91620479. The next prime is 91620511. The reversal of 91620503 is 30502619.

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 91620503 - 2¹² = 91616407 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 (91620553) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3523853 + ... + 3523878.

It is an arithmetic number, because the mean of its divisors is an integer number (24667062).

Almost surely, 2^91620503 is an apocalyptic number.

91620503 is a deficient number, since it is larger than the sum of its proper divisors (7047745).

91620503 is a wasteful number, since it uses less digits than its factorization.

91620503 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7047744.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 91620503 is about 9571.8599550975. The cubic root of 91620503 is about 450.8141688634.

The spelling of 91620503 in words is "ninety-one million, six hundred twenty thousand, five hundred three".