91211048941 has 8 divisors (see below), whose sum is σ = 91452912824. Its totient is φ = 90969246720.

The previous prime is 91211048939. The next prime is 91211048947. The reversal of 91211048941 is 14984011219.

91211048941 = 213554² + 213555².

It can be written as a sum of positive squares in 4 ways, for example, as 2722648041 + 88488400900 = 52179^2 + 297470^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 5-Lehmer number, since φ(91211048941) divides (91211048941-1)⁵.

It is a cyclic number.

It is not a de Polignac number, because 91211048941 - 2¹ = 91211048939 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91211048894 and 91211048903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91211048947) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5499301 + ... + 5515861.

It is an arithmetic number, because the mean of its divisors is an integer number (11431614103).

Almost surely, 2^91211048941 is an apocalyptic number.

91211048941 is the 213555-th centered square number.

It is an amenable number.

91211048941 is a deficient number, since it is larger than the sum of its proper divisors (241863883).

91211048941 is a wasteful number, since it uses less digits than its factorization.

91211048941 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30831.

The product of its (nonzero) digits is 20736, while the sum is 40.

The spelling of 91211048941 in words is "ninety-one billion, two hundred eleven million, forty-eight thousand, nine hundred forty-one".