99257561 has 8 divisors (see below), whose sum is σ = 109167744. Its totient is φ = 89672400.

The previous prime is 99257551. The next prime is 99257563. The reversal of 99257561 is 16575299.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 99257561 - 2¹⁰ = 99256537 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99257563) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80615 + ... + 81836.

It is an arithmetic number, because the mean of its divisors is an integer number (13645968).

Almost surely, 2^99257561 is an apocalyptic number.

It is an amenable number.

99257561 is a deficient number, since it is larger than the sum of its proper divisors (9910183).

99257561 is a wasteful number, since it uses less digits than its factorization.

99257561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162511.

The product of its digits is 170100, while the sum is 44.

The square root of 99257561 is about 9962.8088910708. The cubic root of 99257561 is about 463.0073299239.

The spelling of 99257561 in words is "ninety-nine million, two hundred fifty-seven thousand, five hundred sixty-one".