91914947 has 4 divisors (see below), whose sum is σ = 93022440. Its totient is φ = 90807456.

The previous prime is 91914943. The next prime is 91914959. The reversal of 91914947 is 74941919.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74941919 = 13 ⋅5764763.

It is a cyclic number.

It is not a de Polignac number, because 91914947 - 2² = 91914943 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91914898 and 91914907.

It is not an unprimeable number, because it can be changed into a prime (91914941) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 553622 + ... + 553787.

It is an arithmetic number, because the mean of its divisors is an integer number (23255610).

Almost surely, 2^91914947 is an apocalyptic number.

91914947 is a deficient number, since it is larger than the sum of its proper divisors (1107493).

91914947 is a wasteful number, since it uses less digits than its factorization.

91914947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1107492.

The product of its digits is 81648, while the sum is 44.

The square root of 91914947 is about 9587.2283273113. The cubic root of 91914947 is about 451.2965848423.

The spelling of 91914947 in words is "ninety-one million, nine hundred fourteen thousand, nine hundred forty-seven".