91779600381 has 24 divisors (see below), whose sum is σ = 142364761344. Its totient is φ = 52440796800.

The previous prime is 91779600337. The next prime is 91779600431. The reversal of 91779600381 is 18300697719.

It is not a de Polignac number, because 91779600381 - 2¹⁵ = 91779567613 is a prime.

It is a super-2 number, since 2×91779600381² (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 (91779600281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2254356 + ... + 2294706.

It is an arithmetic number, because the mean of its divisors is an integer number (5931865056).

Almost surely, 2^91779600381 is an apocalyptic number.

It is an amenable number.

91779600381 is a deficient number, since it is larger than the sum of its proper divisors (50585160963).

91779600381 is a wasteful number, since it uses less digits than its factorization.

91779600381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55841 (or 55834 counting only the distinct ones).

The product of its (nonzero) digits is 571536, while the sum is 51.

The spelling of 91779600381 in words is "ninety-one billion, seven hundred seventy-nine million, six hundred thousand, three hundred eighty-one".