91797439381 has 4 divisors (see below), whose sum is σ = 91858680000. Its totient is φ = 91736198764.

The previous prime is 91797439369. The next prime is 91797439397. The reversal of 91797439381 is 18393479719.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 91797439381 - 2¹³ = 91797431189 is a prime.

It is a super-2 number, since 2×91797439381² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91797439081) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30618061 + ... + 30621058.

It is an arithmetic number, because the mean of its divisors is an integer number (22964670000).

Almost surely, 2^91797439381 is an apocalyptic number.

It is an amenable number.

91797439381 is a deficient number, since it is larger than the sum of its proper divisors (61240619).

91797439381 is a wasteful number, since it uses less digits than its factorization.

91797439381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61240618.

The product of its digits is 10287648, while the sum is 61.

The spelling of 91797439381 in words is "ninety-one billion, seven hundred ninety-seven million, four hundred thirty-nine thousand, three hundred eighty-one".