990610691 has 8 divisors (see below), whose sum is σ = 1132322400. Its totient is φ = 848947968.

The previous prime is 990610669. The next prime is 990610711. The reversal of 990610691 is 196016099.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 990610691 - 2¹⁰ = 990609667 is a prime.

It is a super-2 number, since 2×990610691² = 1962619082246994962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990610631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57875 + ... + 73011.

It is an arithmetic number, because the mean of its divisors is an integer number (141540300).

Almost surely, 2^990610691 is an apocalyptic number.

990610691 is a deficient number, since it is larger than the sum of its proper divisors (141711709).

990610691 is a wasteful number, since it uses less digits than its factorization.

990610691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24493.

The product of its (nonzero) digits is 26244, while the sum is 41.

The square root of 990610691 is about 31473.9684660197. The cubic root of 990610691 is about 996.8603834572.

The spelling of 990610691 in words is "nine hundred ninety million, six hundred ten thousand, six hundred ninety-one".