91313161380 has 240 divisors, whose sum is σ = 328851747840. Its totient is φ = 20777409792.

The previous prime is 91313161363. The next prime is 91313161451. The reversal of 91313161380 is 8316131319.

91313161380 is a `hidden beast` number, since 9 + 1 + 3 + 1 + 31 + 613 + 8 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 2510766 + ... + 2546874.

It is an arithmetic number, because the mean of its divisors is an integer number (1370215616).

Almost surely, 2^91313161380 is an apocalyptic number.

91313161380 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 91313161380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164425873920).

91313161380 is an abundant number, since it is smaller than the sum of its proper divisors (237538586460).

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

91313161380 is a wasteful number, since it uses less digits than its factorization.

91313161380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36360 (or 36349 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

Adding to 91313161380 its reverse (8316131319), we get a palindrome (99629292699).

The spelling of 91313161380 in words is "ninety-one billion, three hundred thirteen million, one hundred sixty-one thousand, three hundred eighty".