91409546 has 4 divisors (see below), whose sum is σ = 137114322. Its totient is φ = 45704772.

The previous prime is 91409533. The next prime is 91409579. The reversal of 91409546 is 64590419.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64590419 = 37 ⋅1745687.

It can be written as a sum of positive squares in only one way, i.e., 83631025 + 7778521 = 9145^2 + 2789^2 .

It is a super-2 number, since 2×91409546² = 16711410199852232, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22852385 + ... + 22852388.

Almost surely, 2^91409546 is an apocalyptic number.

91409546 is a deficient number, since it is larger than the sum of its proper divisors (45704776).

91409546 is a wasteful number, since it uses less digits than its factorization.

91409546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45704775.

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 91409546 is about 9560.8339594410. The cubic root of 91409546 is about 450.4679017930.

The spelling of 91409546 in words is "ninety-one million, four hundred nine thousand, five hundred forty-six".