91498990144 has 21 divisors (see below), whose sum is σ = 181573110691. Its totient is φ = 45748285120.

The previous prime is 91498990117. The next prime is 91498990147. The reversal of 91498990144 is 44109989419.

The square root of 91498990144 is 302488.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (91498990147) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 2400999 + ... + 2438809.

Almost surely, 2^91498990144 is an apocalyptic number.

91498990144 is the 302488-th square number.

It is an amenable number.

91498990144 is a deficient number, since it is larger than the sum of its proper divisors (90074120547).

91498990144 is an frugal number, since it uses more digits than its factorization.

91498990144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75634 (or 37813 counting only the distinct ones).

The product of its (nonzero) digits is 3359232, while the sum is 58.

The spelling of 91498990144 in words is "ninety-one billion, four hundred ninety-eight million, nine hundred ninety thousand, one hundred forty-four".