99642261 has 4 divisors (see below), whose sum is σ = 132856352. Its totient is φ = 66428172.

The previous prime is 99642239. The next prime is 99642269. The reversal of 99642261 is 16224699.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 16224699 = 3 ⋅5408233.

It is not a de Polignac number, because 99642261 - 2⁵ = 99642229 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99642269) 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, 16607041 + ... + 16607046.

It is an arithmetic number, because the mean of its divisors is an integer number (33214088).

Almost surely, 2^99642261 is an apocalyptic number.

It is an amenable number.

99642261 is a deficient number, since it is larger than the sum of its proper divisors (33214091).

99642261 is a wasteful number, since it uses less digits than its factorization.

99642261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33214090.

The product of its digits is 46656, while the sum is 39.

The square root of 99642261 is about 9982.0970241728. The cubic root of 99642261 is about 463.6047295777.

The spelling of 99642261 in words is "ninety-nine million, six hundred forty-two thousand, two hundred sixty-one".