91478545 has 4 divisors (see below), whose sum is σ = 109774260. Its totient is φ = 73182832.

The previous prime is 91478531. The next prime is 91478549. The reversal of 91478545 is 54587419.

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 26450449 + 65028096 = 5143^2 + 8064^2 .

It is a cyclic number.

It is not a de Polignac number, because 91478545 - 2¹⁵ = 91445777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91478549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9147850 + ... + 9147859.

It is an arithmetic number, because the mean of its divisors is an integer number (27443565).

Almost surely, 2^91478545 is an apocalyptic number.

It is an amenable number.

91478545 is a deficient number, since it is larger than the sum of its proper divisors (18295715).

91478545 is a wasteful number, since it uses less digits than its factorization.

91478545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18295714.

The product of its digits is 201600, while the sum is 43.

The square root of 91478545 is about 9564.4416982906. The cubic root of 91478545 is about 450.5812160614.

The spelling of 91478545 in words is "ninety-one million, four hundred seventy-eight thousand, five hundred forty-five".