91440257001 has 8 divisors (see below), whose sum is σ = 124514392704. Its totient is φ = 59663146320.

The previous prime is 91440256993. The next prime is 91440257059. The reversal of 91440257001 is 10075204419.

It is a happy number.

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

It is not a de Polignac number, because 91440257001 - 2³ = 91440256993 is a prime.

It is a super-2 number, since 2×91440257001² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (91440258001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 324256090 + ... + 324256371.

It is an arithmetic number, because the mean of its divisors is an integer number (15564299088).

Almost surely, 2^91440257001 is an apocalyptic number.

It is an amenable number.

91440257001 is a deficient number, since it is larger than the sum of its proper divisors (33074135703).

91440257001 is a wasteful number, since it uses less digits than its factorization.

91440257001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648512511.

The product of its (nonzero) digits is 10080, while the sum is 33.

The spelling of 91440257001 in words is "ninety-one billion, four hundred forty million, two hundred fifty-seven thousand, one".