91161445 has 4 divisors (see below), whose sum is σ = 109393740. Its totient is φ = 72929152.

The previous prime is 91161439. The next prime is 91161461. The reversal of 91161445 is 54416119.

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 21372129 + 69789316 = 4623^2 + 8354^2 .

It is a cyclic number.

It is not a de Polignac number, because 91161445 - 2³ = 91161437 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9116140 + ... + 9116149.

It is an arithmetic number, because the mean of its divisors is an integer number (27348435).

Almost surely, 2^91161445 is an apocalyptic number.

It is an amenable number.

91161445 is a deficient number, since it is larger than the sum of its proper divisors (18232295).

91161445 is a wasteful number, since it uses less digits than its factorization.

91161445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18232294.

The product of its digits is 4320, while the sum is 31.

The square root of 91161445 is about 9547.8502816079. The cubic root of 91161445 is about 450.0599837735.

The spelling of 91161445 in words is "ninety-one million, one hundred sixty-one thousand, four hundred forty-five".