91292989 has 4 divisors (see below), whose sum is σ = 91363420. Its totient is φ = 91222560.

The previous prime is 91292987. The next prime is 91293011. The reversal of 91292989 is 98929219.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71267364 + 20025625 = 8442^2 + 4475^2 .

It is a cyclic number.

It is not a de Polignac number, because 91292989 - 2¹ = 91292987 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 (91292987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33234 + ... + 35875.

It is an arithmetic number, because the mean of its divisors is an integer number (22840855).

Almost surely, 2^91292989 is an apocalyptic number.

It is an amenable number.

91292989 is a deficient number, since it is larger than the sum of its proper divisors (70431).

91292989 is a wasteful number, since it uses less digits than its factorization.

91292989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70430.

The product of its digits is 209952, while the sum is 49.

The square root of 91292989 is about 9554.7364694166. The cubic root of 91292989 is about 450.2763553520.

The spelling of 91292989 in words is "ninety-one million, two hundred ninety-two thousand, nine hundred eighty-nine".