91029641 has 4 divisors (see below), whose sum is σ = 91204884. Its totient is φ = 90854400.

The previous prime is 91029623. The next prime is 91029643. The reversal of 91029641 is 14692019.

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 18524416 + 72505225 = 4304^2 + 8515^2 .

It is a cyclic number.

It is not a de Polignac number, because 91029641 - 2¹⁸ = 90767497 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 91029598 and 91029607.

It is not an unprimeable number, because it can be changed into a prime (91029643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86840 + ... + 87881.

It is an arithmetic number, because the mean of its divisors is an integer number (22801221).

Almost surely, 2^91029641 is an apocalyptic number.

It is an amenable number.

91029641 is a deficient number, since it is larger than the sum of its proper divisors (175243).

91029641 is a wasteful number, since it uses less digits than its factorization.

91029641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175242.

The product of its (nonzero) digits is 3888, while the sum is 32.

The square root of 91029641 is about 9540.9454982198. The cubic root of 91029641 is about 449.8429756665.

The spelling of 91029641 in words is "ninety-one million, twenty-nine thousand, six hundred forty-one".