991006725 has 12 divisors (see below), whose sum is σ = 1638464576. Its totient is φ = 528536880.

The previous prime is 991006717. The next prime is 991006739. The reversal of 991006725 is 527600199.

It is not a de Polignac number, because 991006725 - 2³ = 991006717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6606637 + ... + 6606786.

Almost surely, 2^991006725 is an apocalyptic number.

It is an amenable number.

991006725 is a deficient number, since it is larger than the sum of its proper divisors (647457851).

991006725 is a wasteful number, since it uses less digits than its factorization.

991006725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13213436 (or 13213431 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 39.

The square root of 991006725 is about 31480.2592905459. The cubic root of 991006725 is about 996.9932099415.

The spelling of 991006725 in words is "nine hundred ninety-one million, six thousand, seven hundred twenty-five".