991946006 has 4 divisors (see below), whose sum is σ = 1487919012. Its totient is φ = 495973002.

The previous prime is 991946003. The next prime is 991946057. The reversal of 991946006 is 600649199.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 600649199 = 1489 ⋅403391.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (991946003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247986500 + ... + 247986503.

It is an arithmetic number, because the mean of its divisors is an integer number (371979753).

Almost surely, 2^991946006 is an apocalyptic number.

991946006 is a deficient number, since it is larger than the sum of its proper divisors (495973006).

991946006 is a wasteful number, since it uses less digits than its factorization.

991946006 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495973005.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 991946006 is about 31495.1743287761. The cubic root of 991946006 is about 997.3080954856.

The spelling of 991946006 in words is "nine hundred ninety-one million, nine hundred forty-six thousand, six".