91400989 has 8 divisors (see below), whose sum is σ = 96900608. Its totient is φ = 86060880.

The previous prime is 91400987. The next prime is 91401017. The reversal of 91400989 is 98900419.

91400989 is nontrivially palindromic in base 8.

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 91400989 - 2¹ = 91400987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91400987) 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, 38697 + ... + 40990.

It is an arithmetic number, because the mean of its divisors is an integer number (12112576).

Almost surely, 2^91400989 is an apocalyptic number.

It is an amenable number.

91400989 is a deficient number, since it is larger than the sum of its proper divisors (5499619).

91400989 is a wasteful number, since it uses less digits than its factorization.

91400989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79755.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 91400989 is about 9560.3864461642. The cubic root of 91400989 is about 450.4538450039.

The spelling of 91400989 in words is "ninety-one million, four hundred thousand, nine hundred eighty-nine".