991606000394 has 4 divisors (see below), whose sum is σ = 1487409000594. Its totient is φ = 495803000196.

The previous prime is 991606000373. The next prime is 991606000439. The reversal of 991606000394 is 493000606199.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 762064399369 + 229541601025 = 872963^2 + 479105^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 247901500097 + ... + 247901500100.

Almost surely, 2^991606000394 is an apocalyptic number.

991606000394 is a deficient number, since it is larger than the sum of its proper divisors (495803000200).

991606000394 is a wasteful number, since it uses less digits than its factorization.

991606000394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495803000199.

The product of its (nonzero) digits is 314928, while the sum is 47.

The spelling of 991606000394 in words is "nine hundred ninety-one billion, six hundred six million, three hundred ninety-four", and thus it is an aban number.