91945973 has 8 divisors (see below), whose sum is σ = 109650048. Its totient is φ = 75384144.

The previous prime is 91945961. The next prime is 91945981. The reversal of 91945973 is 37954919.

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

It is a cyclic number.

It is not a de Polignac number, because 91945973 - 2⁸ = 91945717 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91945943) 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, 285386 + ... + 285707.

It is an arithmetic number, because the mean of its divisors is an integer number (13706256).

Almost surely, 2^91945973 is an apocalyptic number.

It is an amenable number.

91945973 is a deficient number, since it is larger than the sum of its proper divisors (17704075).

91945973 is a wasteful number, since it uses less digits than its factorization.

91945973 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 571123.

The product of its digits is 306180, while the sum is 47.

The square root of 91945973 is about 9588.8462809662. The cubic root of 91945973 is about 451.3473576968.

The spelling of 91945973 in words is "ninety-one million, nine hundred forty-five thousand, nine hundred seventy-three".