91949141890 has 32 divisors (see below), whose sum is σ = 166520234160. Its totient is φ = 36554959104.

The previous prime is 91949141839. The next prime is 91949141909. The reversal of 91949141890 is 9814194919.

It can be written as a sum of positive squares in 8 ways, for example, as 67557886561 + 24391255329 = 259919^2 + 156177^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6700356 + ... + 6714064.

Almost surely, 2^91949141890 is an apocalyptic number.

91949141890 is a deficient number, since it is larger than the sum of its proper divisors (74571092270).

91949141890 is a wasteful number, since it uses less digits than its factorization.

91949141890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17766.

The product of its (nonzero) digits is 839808, while the sum is 55.

The spelling of 91949141890 in words is "ninety-one billion, nine hundred forty-nine million, one hundred forty-one thousand, eight hundred ninety".