91971367 has 8 divisors (see below), whose sum is σ = 94430336. Its totient is φ = 89527032.

The previous prime is 91971337. The next prime is 91971371. The reversal of 91971367 is 76317919.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91971367 - 2¹⁹ = 91447079 is a prime.

It is a super-3 number, since 3×91971367³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91971317) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9718 + ... + 16684.

It is an arithmetic number, because the mean of its divisors is an integer number (11803792).

Almost surely, 2^91971367 is an apocalyptic number.

91971367 is a deficient number, since it is larger than the sum of its proper divisors (2458969).

91971367 is a wasteful number, since it uses less digits than its factorization.

91971367 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7317.

The product of its digits is 71442, while the sum is 43.

The square root of 91971367 is about 9590.1703321682. The cubic root of 91971367 is about 451.3889055008.

The spelling of 91971367 in words is "ninety-one million, nine hundred seventy-one thousand, three hundred sixty-seven".