990649261 has 8 divisors (see below), whose sum is σ = 1181395584. Its totient is φ = 812209200.

The previous prime is 990649249. The next prime is 990649267. The reversal of 990649261 is 162946099.

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 990649261 - 2⁵ = 990649229 is a prime.

It is a super-2 number, since 2×990649261² = 1962771916639692242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990649267) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3076390 + ... + 3076711.

It is an arithmetic number, because the mean of its divisors is an integer number (147674448).

Almost surely, 2^990649261 is an apocalyptic number.

It is an amenable number.

990649261 is a deficient number, since it is larger than the sum of its proper divisors (190746323).

990649261 is a wasteful number, since it uses less digits than its factorization.

990649261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6153131.

The product of its (nonzero) digits is 209952, while the sum is 46.

The square root of 990649261 is about 31474.5811886354. The cubic root of 990649261 is about 996.8733210678.

The spelling of 990649261 in words is "nine hundred ninety million, six hundred forty-nine thousand, two hundred sixty-one".