1640530969 has 32 divisors (see below), whose sum is σ = 2100916224. Its totient is φ = 1243831680.

The previous prime is 1640530963. The next prime is 1640530993. The reversal of 1640530969 is 9690350461.

It is not a de Polignac number, because 1640530969 - 2³ = 1640530961 is a prime.

It is a super-2 number, since 2×1640530969² = 5382683720496157922, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is not an unprimeable number, because it can be changed into a prime (1640530961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1035552 + ... + 1037134.

It is an arithmetic number, because the mean of its divisors is an integer number (65653632).

Almost surely, 2^1640530969 is an apocalyptic number.

It is an amenable number.

1640530969 is a deficient number, since it is larger than the sum of its proper divisors (460385255).

1640530969 is a wasteful number, since it uses less digits than its factorization.

1640530969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1957.

The product of its (nonzero) digits is 174960, while the sum is 43.

The square root of 1640530969 is about 40503.4686045529. The cubic root of 1640530969 is about 1179.4009621035.

It can be divided in two parts, 16405 and 30969, that added together give a palindrome (47374).

The spelling of 1640530969 in words is "one billion, six hundred forty million, five hundred thirty thousand, nine hundred sixty-nine".