1020649 has 4 divisors (see below), whose sum is σ = 1166464. Its totient is φ = 874836.

The previous prime is 1020631. The next prime is 1020667. The reversal of 1020649 is 9460201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 9460201 = 139 ⋅68059.

It is an interprime number because it is at equal distance from previous prime (1020631) and next prime (1020667).

It is a cyclic number.

It is not a de Polignac number, because 1020649 - 2⁹ = 1020137 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020619) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72897 + ... + 72910.

It is an arithmetic number, because the mean of its divisors is an integer number (291616).

2^1020649 is an apocalyptic number.

It is an amenable number.

1020649 is a deficient number, since it is larger than the sum of its proper divisors (145815).

1020649 is an equidigital number, since it uses as much as digits as its factorization.

1020649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145814.

The product of its (nonzero) digits is 432, while the sum is 22.

The square root of 1020649 is about 1010.2717456209. The cubic root of 1020649 is about 100.6836160419.

The spelling of 1020649 in words is "one million, twenty thousand, six hundred forty-nine".