991424606 has 4 divisors (see below), whose sum is σ = 1487136912. Its totient is φ = 495712302.

The previous prime is 991424593. The next prime is 991424639. The reversal of 991424606 is 606424199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 606424199 = 383 ⋅1583353.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247856150 + ... + 247856153.

It is an arithmetic number, because the mean of its divisors is an integer number (371784228).

Almost surely, 2^991424606 is an apocalyptic number.

991424606 is a deficient number, since it is larger than the sum of its proper divisors (495712306).

991424606 is a wasteful number, since it uses less digits than its factorization.

991424606 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495712305.

The product of its (nonzero) digits is 93312, while the sum is 41.

The square root of 991424606 is about 31486.8957822139. The cubic root of 991424606 is about 997.1333253625.

The spelling of 991424606 in words is "nine hundred ninety-one million, four hundred twenty-four thousand, six hundred six".