10649991 has 8 divisors (see below), whose sum is σ = 15490944. Its totient is φ = 6454520.

The previous prime is 10649987. The next prime is 10649993. The reversal of 10649991 is 19994601.

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 10649991 - 2² = 10649987 is a prime.

It is a super-2 number, since 2×10649991² = 226844616600162, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10649993) 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, 161331 + ... + 161396.

It is an arithmetic number, because the mean of its divisors is an integer number (1936368).

Almost surely, 2^10649991 is an apocalyptic number.

10649991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

10649991 is a deficient number, since it is larger than the sum of its proper divisors (4840953).

10649991 is a wasteful number, since it uses less digits than its factorization.

10649991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322741.

The product of its (nonzero) digits is 17496, while the sum is 39.

The square root of 10649991 is about 3263.4323955002. The cubic root of 10649991 is about 220.0137112667.

The spelling of 10649991 in words is "ten million, six hundred forty-nine thousand, nine hundred ninety-one".