91561298 has 8 divisors (see below), whose sum is σ = 143313408. Its totient is φ = 43790164.

The previous prime is 91561297. The next prime is 91561339. The reversal of 91561298 is 89216519.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (91561297) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 995186 + ... + 995277.

It is an arithmetic number, because the mean of its divisors is an integer number (17914176).

Almost surely, 2^91561298 is an apocalyptic number.

91561298 is a deficient number, since it is larger than the sum of its proper divisors (51752110).

91561298 is a wasteful number, since it uses less digits than its factorization.

91561298 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1990488.

The product of its digits is 38880, while the sum is 41.

The square root of 91561298 is about 9568.7667961969. The cubic root of 91561298 is about 450.7170428448.

The spelling of 91561298 in words is "ninety-one million, five hundred sixty-one thousand, two hundred ninety-eight".