91891396 has 9 divisors (see below), whose sum is σ = 160843501. Its totient is φ = 45936112.

The previous prime is 91891367. The next prime is 91891399. The reversal of 91891396 is 69319819.

The square root of 91891396 is 9586.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 79388100 + 12503296 = 8910^2 + 3536^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91891399) 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 2 ways as a sum of consecutive naturals, for example, 16776 + ... + 21568.

Almost surely, 2^91891396 is an apocalyptic number.

91891396 is the 9586-th square number.

It is an amenable number.

91891396 is a deficient number, since it is larger than the sum of its proper divisors (68952105).

91891396 is an frugal number, since it uses more digits than its factorization.

91891396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9590 (or 4795 counting only the distinct ones).

The product of its digits is 104976, while the sum is 46.

The cubic root of 91891396 is about 451.2580369090.

Multiplying 91891396 by its product of digits (104976), we get a square (9646391186496 = 3105864²).

It can be divided in two parts, 9189 and 1396, that added together give a triangular number (10585 = T₁₄₅).

The spelling of 91891396 in words is "ninety-one million, eight hundred ninety-one thousand, three hundred ninety-six".