91421491 has 8 divisors (see below), whose sum is σ = 104556800. Its totient is φ = 78304968.

The previous prime is 91421489. The next prime is 91421497. The reversal of 91421491 is 19412419.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 91421491 - 2¹ = 91421489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91421497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8050 + ... + 15736.

It is an arithmetic number, because the mean of its divisors is an integer number (13069600).

Almost surely, 2^91421491 is an apocalyptic number.

91421491 is a deficient number, since it is larger than the sum of its proper divisors (13135309).

91421491 is a wasteful number, since it uses less digits than its factorization.

91421491 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9393.

The product of its digits is 2592, while the sum is 31.

The square root of 91421491 is about 9561.4586230345. The cubic root of 91421491 is about 450.4875226640.

The spelling of 91421491 in words is "ninety-one million, four hundred twenty-one thousand, four hundred ninety-one".