91421291642 has 8 divisors (see below), whose sum is σ = 137149888500. Its totient is φ = 45704662144.

The previous prime is 91421291609. The next prime is 91421291669. The reversal of 91421291642 is 24619212419.

It can be written as a sum of positive squares in 2 ways, for example, as 90678674641 + 742617001 = 301129^2 + 27251^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 91421291642.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2972717 + ... + 3003312.

Almost surely, 2^91421291642 is an apocalyptic number.

91421291642 is a deficient number, since it is larger than the sum of its proper divisors (45728596858).

91421291642 is a wasteful number, since it uses less digits than its factorization.

91421291642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5983680.

The product of its digits is 62208, while the sum is 41.

The spelling of 91421291642 in words is "ninety-one billion, four hundred twenty-one million, two hundred ninety-one thousand, six hundred forty-two".