91145420 has 12 divisors (see below), whose sum is σ = 191405424. Its totient is φ = 36458160.

The previous prime is 91145401. The next prime is 91145429. The reversal of 91145420 is 2454119.

It is a self number, because there is not a number n which added to its sum of digits gives 91145420.

It is not an unprimeable number, because it can be changed into a prime (91145429) 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, 2278616 + ... + 2278655.

It is an arithmetic number, because the mean of its divisors is an integer number (15950452).

Almost surely, 2^91145420 is an apocalyptic number.

It is an amenable number.

91145420 is an abundant number, since it is smaller than the sum of its proper divisors (100260004).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91145420 is a wasteful number, since it uses less digits than its factorization.

91145420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4557280 (or 4557278 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 26.

The square root of 91145420 is about 9547.0110505854. The cubic root of 91145420 is about 450.0336106583.

Adding to 91145420 its reverse (2454119), we get a palindrome (93599539).

The spelling of 91145420 in words is "ninety-one million, one hundred forty-five thousand, four hundred twenty".