91075393369 has 9 divisors (see below), whose sum is σ = 93068891391. Its totient is φ = 89123736840.

The previous prime is 91075393361. The next prime is 91075393373. The reversal of 91075393369 is 96339357019.

The square root of 91075393369 is 301787.

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., 25221568969 + 65853824400 = 158813^2 + 256620^2 .

It is not a de Polignac number, because 91075393369 - 2³ = 91075393361 is a prime.

It is a super-2 number, since 2×91075393369² (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 (91075393361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 14180779 + ... + 14187199.

Almost surely, 2^91075393369 is an apocalyptic number.

91075393369 is the 301787-th square number.

91075393369 is the 150894-th centered octagonal number.

It is an amenable number.

91075393369 is a deficient number, since it is larger than the sum of its proper divisors (1993498022).

91075393369 is an frugal number, since it uses more digits than its factorization.

91075393369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12936 (or 6468 counting only the distinct ones).

The product of its (nonzero) digits is 4133430, while the sum is 55.

The spelling of 91075393369 in words is "ninety-one billion, seventy-five million, three hundred ninety-three thousand, three hundred sixty-nine".