91194940225 has 9 divisors (see below), whose sum is σ = 113083598217. Its totient is φ = 72954744240.

The previous prime is 91194940217. The next prime is 91194940253. The reversal of 91194940225 is 52204949119.

It is a happy number.

The square root of 91194940225 is 301985.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 16066323009 + 75128617216 = 126753^2 + 274096^2 .

It is not a de Polignac number, because 91194940225 - 2³ = 91194940217 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 1479727 + ... + 1540123.

Almost surely, 2^91194940225 is an apocalyptic number.

91194940225 is the 301985-th square number.

91194940225 is the 150993-rd centered octagonal number.

It is an amenable number.

91194940225 is a deficient number, since it is larger than the sum of its proper divisors (21888657992).

91194940225 is an frugal number, since it uses more digits than its factorization.

91194940225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120804 (or 60402 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 46.

The spelling of 91194940225 in words is "ninety-one billion, one hundred ninety-four million, nine hundred forty thousand, two hundred twenty-five".