1690751009 has 4 divisors (see below), whose sum is σ = 1707491220. Its totient is φ = 1674010800.

The previous prime is 1690751003. The next prime is 1690751033. The reversal of 1690751009 is 9001570961.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9001570961 = 21067 ⋅427283.

It can be written as a sum of positive squares in 2 ways, for example, as 1188318784 + 502432225 = 34472^2 + 22415^2 .

It is a cyclic number.

It is not a de Polignac number, because 1690751009 - 2¹⁶ = 1690685473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1690751003) 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, 8369954 + ... + 8370155.

It is an arithmetic number, because the mean of its divisors is an integer number (426872805).

Almost surely, 2^1690751009 is an apocalyptic number.

It is an amenable number.

1690751009 is a deficient number, since it is larger than the sum of its proper divisors (16740211).

1690751009 is a wasteful number, since it uses less digits than its factorization.

1690751009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16740210.

The product of its (nonzero) digits is 17010, while the sum is 38.

The square root of 1690751009 is about 41118.7427944970. The cubic root of 1690751009 is about 1191.3148400291.

The spelling of 1690751009 in words is "one billion, six hundred ninety million, seven hundred fifty-one thousand, nine".