91621703 has 4 divisors (see below), whose sum is σ = 91828968. Its totient is φ = 91414440.

The previous prime is 91621679. The next prime is 91621723. The reversal of 91621703 is 30712619.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 30712619 = 7 ⋅4387517.

It is a cyclic number.

It is not a de Polignac number, because 91621703 - 2¹⁸ = 91359559 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 (91621723) 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, 102968 + ... + 103853.

It is an arithmetic number, because the mean of its divisors is an integer number (22957242).

Almost surely, 2^91621703 is an apocalyptic number.

91621703 is a deficient number, since it is larger than the sum of its proper divisors (207265).

91621703 is a wasteful number, since it uses less digits than its factorization.

91621703 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207264.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 91621703 is about 9571.9226386343. The cubic root of 91621703 is about 450.8161370351.

The spelling of 91621703 in words is "ninety-one million, six hundred twenty-one thousand, seven hundred three".