91292809609 has 9 divisors (see below), whose sum is σ = 92582895783. Its totient is φ = 90020468592.

The previous prime is 91292809591. The next prime is 91292809631. The reversal of 91292809609 is 90690829219.

The square root of 91292809609 is 302147.

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

It can be written as a sum of positive squares in only one way, i.e., 51822246025 + 39470563584 = 227645^2 + 198672^2 .

It is not a de Polignac number, because 91292809609 - 2⁵ = 91292809577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 91292809609.

It is not an unprimeable number, because it can be changed into a prime (91292809649) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 22054662 + ... + 22058800.

Almost surely, 2^91292809609 is an apocalyptic number.

91292809609 is the 302147-th square number.

91292809609 is the 151074-th centered octagonal number.

It is an amenable number.

91292809609 is a deficient number, since it is larger than the sum of its proper divisors (1290086174).

91292809609 is an frugal number, since it uses more digits than its factorization.

91292809609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8424 (or 4212 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 55.

The spelling of 91292809609 in words is "ninety-one billion, two hundred ninety-two million, eight hundred nine thousand, six hundred nine".