91299451320 has 1920 divisors, whose sum is σ = 433815782400. Its totient is φ = 16751370240.

The previous prime is 91299451307. The next prime is 91299451333. The reversal of 91299451320 is 2315499219.

91299451320 is a `hidden beast` number, since 9 + 1 + 29 + 94 + 513 + 20 = 666.

It is an interprime number because it is at equal distance from previous prime (91299451307) and next prime (91299451333).

It is a super-2 number, since 2×91299451320² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 479 ways as a sum of consecutive naturals, for example, 886402389 + ... + 886402491.

It is an arithmetic number, because the mean of its divisors is an integer number (225945720).

Almost surely, 2^91299451320 is an apocalyptic number.

91299451320 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 91299451320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216907891200).

91299451320 is an abundant number, since it is smaller than the sum of its proper divisors (342516331080).

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

91299451320 is a wasteful number, since it uses less digits than its factorization.

91299451320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The spelling of 91299451320 in words is "ninety-one billion, two hundred ninety-nine million, four hundred fifty-one thousand, three hundred twenty".