91901133409 has 8 divisors (see below), whose sum is σ = 92053563912. Its totient is φ = 91748751360.

The previous prime is 91901133407. The next prime is 91901133427. The reversal of 91901133409 is 90433110919.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 30845194384 + 61055939025 = 175628^2 + 247095^2 .

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 91901133409 - 2¹ = 91901133407 is a prime.

It is a super-2 number, since 2×91901133409² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91901133403) 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, 6934029 + ... + 6947269.

It is an arithmetic number, because the mean of its divisors is an integer number (11506695489).

Almost surely, 2^91901133409 is an apocalyptic number.

It is an amenable number.

91901133409 is a deficient number, since it is larger than the sum of its proper divisors (152430503).

91901133409 is a wasteful number, since it uses less digits than its factorization.

91901133409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24227.

The product of its (nonzero) digits is 26244, while the sum is 40.

The spelling of 91901133409 in words is "ninety-one billion, nine hundred one million, one hundred thirty-three thousand, four hundred nine".