91918191010 has 16 divisors (see below), whose sum is σ = 165469289472. Its totient is φ = 36763599600.

The previous prime is 91918190989. The next prime is 91918191011. The reversal of 91918191010 is 1019181919.

It is not an unprimeable number, because it can be changed into a prime (91918191011) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 353436 + ... + 555655.

It is an arithmetic number, because the mean of its divisors is an integer number (10341830592).

Almost surely, 2^91918191010 is an apocalyptic number.

91918191010 is a deficient number, since it is larger than the sum of its proper divisors (73551098462).

91918191010 is a wasteful number, since it uses less digits than its factorization.

91918191010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 919209.

The product of its (nonzero) digits is 5832, while the sum is 40.

The spelling of 91918191010 in words is "ninety-one billion, nine hundred eighteen million, one hundred ninety-one thousand, ten".