91804758049 has 27 divisors (see below), whose sum is σ = 99811922931. Its totient is φ = 84425969520.

The previous prime is 91804758047. The next prime is 91804758053. The reversal of 91804758049 is 94085740819.

It is a happy number.

The square root of 91804758049 is 302993.

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., 82148158225 + 9656599824 = 286615^2 + 98268^2 .

It is not a de Polignac number, because 91804758049 - 2¹ = 91804758047 is a prime.

It is a super-2 number, since 2×91804758049² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91804758047) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 213003864 + ... + 213004294.

Almost surely, 2^91804758049 is an apocalyptic number.

91804758049 is the 302993-rd square number.

91804758049 is the 151497-th centered octagonal number.

It is an amenable number.

91804758049 is a deficient number, since it is larger than the sum of its proper divisors (8007164882).

91804758049 is an frugal number, since it uses more digits than its factorization.

91804758049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 974 (or 487 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The spelling of 91804758049 in words is "ninety-one billion, eight hundred four million, seven hundred fifty-eight thousand, forty-nine".