91621051200 has 1008 divisors, whose sum is σ = 398101377024. Its totient is φ = 19508428800.

The previous prime is 91621051141. The next prime is 91621051231. The reversal of 91621051200 is 215012619.

91621051200 is a `hidden beast` number, since 91 + 62 + 1 + 0 + 512 + 0 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (1008).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 217626990 + ... + 217627410.

Almost surely, 2^91621051200 is an apocalyptic number.

91621051200 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 91621051200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (199050688512).

91621051200 is an abundant number, since it is smaller than the sum of its proper divisors (306480325824).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

91621051200 is a wasteful number, since it uses less digits than its factorization.

91621051200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 600 (or 582 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

Adding to 91621051200 its reverse (215012619), we get a palindrome (91836063819).

The spelling of 91621051200 in words is "ninety-one billion, six hundred twenty-one million, fifty-one thousand, two hundred".