91209987452 has 48 divisors (see below), whose sum is σ = 165188170560. Its totient is φ = 44032896000.

The previous prime is 91209987403. The next prime is 91209987487. The reversal of 91209987452 is 25478990219.

It is a congruent number.

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, 33274802 + ... + 33277542.

It is an arithmetic number, because the mean of its divisors is an integer number (3441420220).

Almost surely, 2^91209987452 is an apocalyptic number.

It is an amenable number.

91209987452 is a deficient number, since it is larger than the sum of its proper divisors (73978183108).

91209987452 is a wasteful number, since it uses less digits than its factorization.

91209987452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4422 (or 4420 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 56.

The spelling of 91209987452 in words is "ninety-one billion, two hundred nine million, nine hundred eighty-seven thousand, four hundred fifty-two".