91070010691945 has 4 divisors (see below), whose sum is σ = 109284012830340. Its totient is φ = 72856008553552.

The previous prime is 91070010691909. The next prime is 91070010691963. The reversal of 91070010691945 is 54919601007019.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21226734133504 + 69843276558441 = 4607248^2 + 8357229^2 .

It is a cyclic number.

It is not a de Polignac number, because 91070010691945 - 2²³ = 91070002303337 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 91070010691892 and 91070010691901.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9107001069190 + ... + 9107001069199.

It is an arithmetic number, because the mean of its divisors is an integer number (27321003207585).

Almost surely, 2^{91070010691945} is an apocalyptic number.

It is an amenable number.

91070010691945 is a deficient number, since it is larger than the sum of its proper divisors (18214002138395).

91070010691945 is a wasteful number, since it uses less digits than its factorization.

91070010691945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18214002138394.

The product of its (nonzero) digits is 612360, while the sum is 52.

The spelling of 91070010691945 in words is "ninety-one trillion, seventy billion, ten million, six hundred ninety-one thousand, nine hundred forty-five".