1021702645 has 16 divisors (see below), whose sum is σ = 1273348080. Its totient is φ = 786322944.

The previous prime is 1021702609. The next prime is 1021702679. The reversal of 1021702645 is 5462071201.

It can be written as a sum of positive squares in 8 ways, for example, as 7789681 + 1013912964 = 2791^2 + 31842^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021702645 - 2²³ = 1013314037 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14562 + ... + 47491.

It is an arithmetic number, because the mean of its divisors is an integer number (79584255).

Almost surely, 2^1021702645 is an apocalyptic number.

It is an amenable number.

1021702645 is a deficient number, since it is larger than the sum of its proper divisors (251645435).

1021702645 is an equidigital number, since it uses as much as digits as its factorization.

1021702645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62184.

The product of its (nonzero) digits is 3360, while the sum is 28.

The square root of 1021702645 is about 31964.0836721468. The cubic root of 1021702645 is about 1007.1825031375.

Adding to 1021702645 its reverse (5462071201), we get a palindrome (6483773846).

The spelling of 1021702645 in words is "one billion, twenty-one million, seven hundred two thousand, six hundred forty-five".