91409488 has 10 divisors (see below), whose sum is σ = 177105914. Its totient is φ = 45704736.

The previous prime is 91409473. The next prime is 91409489. The reversal of 91409488 is 88490419.

It can be written as a sum of positive squares in only one way, i.e., 61027344 + 30382144 = 7812^2 + 5512^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91409489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2856531 + ... + 2856562.

Almost surely, 2^91409488 is an apocalyptic number.

It is an amenable number.

91409488 is a deficient number, since it is larger than the sum of its proper divisors (85696426).

91409488 is a wasteful number, since it uses less digits than its factorization.

91409488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5713101 (or 5713095 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 43.

The square root of 91409488 is about 9560.8309262323. The cubic root of 91409488 is about 450.4678065180.

The spelling of 91409488 in words is "ninety-one million, four hundred nine thousand, four hundred eighty-eight".