99406291 has 4 divisors (see below), whose sum is σ = 99802584. Its totient is φ = 99010000.

The previous prime is 99406283. The next prime is 99406303. The reversal of 99406291 is 19260499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 19260499 = 23 ⋅837413.

It is a cyclic number.

It is not a de Polignac number, because 99406291 - 2³ = 99406283 is a prime.

It is a super-2 number, since 2×99406291² = 19763221380753362, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99406211) 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, 197770 + ... + 198271.

It is an arithmetic number, because the mean of its divisors is an integer number (24950646).

Almost surely, 2^99406291 is an apocalyptic number.

99406291 is a deficient number, since it is larger than the sum of its proper divisors (396293).

99406291 is a wasteful number, since it uses less digits than its factorization.

99406291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396292.

The product of its (nonzero) digits is 34992, while the sum is 40.

The square root of 99406291 is about 9970.2703574176. The cubic root of 99406291 is about 463.2384750804.

The spelling of 99406291 in words is "ninety-nine million, four hundred six thousand, two hundred ninety-one".