91545481 has 4 divisors (see below), whose sum is σ = 92355732. Its totient is φ = 90735232.

The previous prime is 91545463. The next prime is 91545499. The reversal of 91545481 is 18454519.

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

It is an interprime number because it is at equal distance from previous prime (91545463) and next prime (91545499).

It can be written as a sum of positive squares in 2 ways, for example, as 47389456 + 44156025 = 6884^2 + 6645^2 .

It is a cyclic number.

It is not a de Polignac number, because 91545481 - 2⁷ = 91545353 is a prime.

It is a super-3 number, since 3×91545481³ (a number of 25 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91545481.

It is not an unprimeable number, because it can be changed into a prime (91545281) 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, 404956 + ... + 405181.

It is an arithmetic number, because the mean of its divisors is an integer number (23088933).

Almost surely, 2^91545481 is an apocalyptic number.

It is an amenable number.

91545481 is a deficient number, since it is larger than the sum of its proper divisors (810251).

91545481 is a wasteful number, since it uses less digits than its factorization.

91545481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810250.

The product of its digits is 28800, while the sum is 37.

The square root of 91545481 is about 9567.9402694624. The cubic root of 91545481 is about 450.6910879120.

The spelling of 91545481 in words is "ninety-one million, five hundred forty-five thousand, four hundred eighty-one".