91718925 has 48 divisors (see below), whose sum is σ = 158466048. Its totient is φ = 46756800.

The previous prime is 91718923. The next prime is 91718933. The reversal of 91718925 is 52981719.

It is not a de Polignac number, because 91718925 - 2¹ = 91718923 is a prime.

It is a super-2 number, since 2×91718925² = 16824722406311250, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91718923) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 239284 + ... + 239666.

It is an arithmetic number, because the mean of its divisors is an integer number (3301376).

Almost surely, 2^91718925 is an apocalyptic number.

It is an amenable number.

91718925 is a deficient number, since it is larger than the sum of its proper divisors (66747123).

91718925 is a wasteful number, since it uses less digits than its factorization.

91718925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 530 (or 525 counting only the distinct ones).

The product of its digits is 45360, while the sum is 42.

The square root of 91718925 is about 9576.9997911663. Note that the first 3 decimals coincide. The cubic root of 91718925 is about 450.9755379610.

The spelling of 91718925 in words is "ninety-one million, seven hundred eighteen thousand, nine hundred twenty-five".