91919181910 has 32 divisors (see below), whose sum is σ = 174357634752. Its totient is φ = 34820860800.

The previous prime is 91919181853. The next prime is 91919181919. The reversal of 91919181910 is 1918191919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (91919181919) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1955229 + ... + 2001688.

It is an arithmetic number, because the mean of its divisors is an integer number (5448676086).

Almost surely, 2^91919181910 is an apocalyptic number.

91919181910 is a deficient number, since it is larger than the sum of its proper divisors (82438452842).

91919181910 is a wasteful number, since it uses less digits than its factorization.

91919181910 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3957048.

The product of its (nonzero) digits is 52488, while the sum is 49.

The spelling of 91919181910 in words is "ninety-one billion, nine hundred nineteen million, one hundred eighty-one thousand, nine hundred ten".