91000454648 has 32 divisors (see below), whose sum is σ = 176529250800. Its totient is φ = 43926339072.

The previous prime is 91000454641. The next prime is 91000454653. The reversal of 91000454648 is 84645400019.

It is a super-2 number, since 2×91000454648² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91000454641) 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, 2883611 + ... + 2914997.

Almost surely, 2^91000454648 is an apocalyptic number.

It is an amenable number.

91000454648 is a deficient number, since it is larger than the sum of its proper divisors (85528796152).

91000454648 is a wasteful number, since it uses less digits than its factorization.

91000454648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43919 (or 43915 counting only the distinct ones).

The product of its (nonzero) digits is 138240, while the sum is 41.

The spelling of 91000454648 in words is "ninety-one billion, four hundred fifty-four thousand, six hundred forty-eight".