91380945 has 16 divisors (see below), whose sum is σ = 147363840. Its totient is φ = 48351744.

The previous prime is 91380941. The next prime is 91380973. The reversal of 91380945 is 54908319.

It is not a de Polignac number, because 91380945 - 2² = 91380941 is a prime.

It is not an unprimeable number, because it can be changed into a prime (91380941) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22080 + ... + 25889.

It is an arithmetic number, because the mean of its divisors is an integer number (9210240).

Almost surely, 2^91380945 is an apocalyptic number.

It is an amenable number.

91380945 is a deficient number, since it is larger than the sum of its proper divisors (55982895).

91380945 is a wasteful number, since it uses less digits than its factorization.

91380945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48104.

The product of its (nonzero) digits is 38880, while the sum is 39.

The square root of 91380945 is about 9559.3381047016. The cubic root of 91380945 is about 450.4209148097.

The spelling of 91380945 in words is "ninety-one million, three hundred eighty thousand, nine hundred forty-five".