91440257002 has 8 divisors (see below), whose sum is σ = 138701513700. Its totient is φ = 45206419104.

The previous prime is 91440256993. The next prime is 91440257059. The reversal of 91440257002 is 20075204419.

It can be written as a sum of positive squares in 2 ways, for example, as 91257763921 + 182493081 = 302089^2 + 13509^2 .

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

It is a super-2 number, since 2×91440257002² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 256854477 + ... + 256854832.

Almost surely, 2^91440257002 is an apocalyptic number.

91440257002 is a deficient number, since it is larger than the sum of its proper divisors (47261256698).

91440257002 is a wasteful number, since it uses less digits than its factorization.

91440257002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 513709400.

The product of its (nonzero) digits is 20160, while the sum is 34.

The spelling of 91440257002 in words is "ninety-one billion, four hundred forty million, two hundred fifty-seven thousand, two".