91214471 has 4 divisors (see below), whose sum is σ = 91240344. Its totient is φ = 91188600.

The previous prime is 91214467. The next prime is 91214477. The reversal of 91214471 is 17441219.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17441219 = 1373 ⋅12703.

It is a cyclic number.

It is not a de Polignac number, because 91214471 - 2² = 91214467 is a prime.

It is a super-3 number, since 3×91214471³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91214477) 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, 6620 + ... + 15041.

It is an arithmetic number, because the mean of its divisors is an integer number (22810086).

Almost surely, 2^91214471 is an apocalyptic number.

91214471 is a deficient number, since it is larger than the sum of its proper divisors (25873).

91214471 is a wasteful number, since it uses less digits than its factorization.

91214471 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25872.

The product of its digits is 2016, while the sum is 29.

The square root of 91214471 is about 9550.6267333615. The cubic root of 91214471 is about 450.1472291911.

The spelling of 91214471 in words is "ninety-one million, two hundred fourteen thousand, four hundred seventy-one".