1020645969 has 8 divisors (see below), whose sum is σ = 1555270080. Its totient is φ = 583226256.

The previous prime is 1020645947. The next prime is 1020645973. The reversal of 1020645969 is 9695460201.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1020645969 - 2¹² = 1020641873 is a prime.

It is a super-2 number, since 2×1020645969² = 2083436388071897922, which contains 22 as substring.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1020645969.

It is not an unprimeable number, because it can be changed into a prime (1020695969) 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, 24301074 + ... + 24301115.

It is an arithmetic number, because the mean of its divisors is an integer number (194408760).

Almost surely, 2^1020645969 is an apocalyptic number.

It is an amenable number.

1020645969 is a deficient number, since it is larger than the sum of its proper divisors (534624111).

1020645969 is an equidigital number, since it uses as much as digits as its factorization.

1020645969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48602199.

The product of its (nonzero) digits is 116640, while the sum is 42.

The square root of 1020645969 is about 31947.5502816726. The cubic root of 1020645969 is about 1006.8351637580.

The spelling of 1020645969 in words is "one billion, twenty million, six hundred forty-five thousand, nine hundred sixty-nine".