91488391 has 8 divisors (see below), whose sum is σ = 93966224. Its totient is φ = 89026560.

The previous prime is 91488389. The next prime is 91488403. The reversal of 91488391 is 19388419.

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 91488391 - 2¹ = 91488389 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91488361) 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, 8071 + ... + 15751.

It is an arithmetic number, because the mean of its divisors is an integer number (11745778).

Almost surely, 2^91488391 is an apocalyptic number.

91488391 is a deficient number, since it is larger than the sum of its proper divisors (2477833).

91488391 is a wasteful number, since it uses less digits than its factorization.

91488391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8001.

The product of its digits is 62208, while the sum is 43.

The square root of 91488391 is about 9564.9564034553. The cubic root of 91488391 is about 450.5973811032.

It can be divided in two parts, 9 and 1488391, that added together give a square (1488400 = 1220²).

The spelling of 91488391 in words is "ninety-one million, four hundred eighty-eight thousand, three hundred ninety-one".