1522020643 has 24 divisors (see below), whose sum is σ = 1813424144. Its totient is φ = 1268879040.

The previous prime is 1522020637. The next prime is 1522020679. The reversal of 1522020643 is 3460202251.

It is a de Polignac number, because none of the positive numbers 2^k-1522020643 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1522020683) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 243880 + ... + 250042.

Almost surely, 2^1522020643 is an apocalyptic number.

1522020643 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1522020643 is a deficient number, since it is larger than the sum of its proper divisors (291403501).

1522020643 is a wasteful number, since it uses less digits than its factorization.

1522020643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6355 (or 6344 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 1522020643 is about 39013.0829722543. The cubic root of 1522020643 is about 1150.2886844253.

Adding to 1522020643 its reverse (3460202251), we get a palindrome (4982222894).

The spelling of 1522020643 in words is "one billion, five hundred twenty-two million, twenty thousand, six hundred forty-three".