1022002642 has 4 divisors (see below), whose sum is σ = 1533003966. Its totient is φ = 511001320.

The previous prime is 1022002633. The next prime is 1022002649. The reversal of 1022002642 is 2462002201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 918756721 + 103245921 = 30311^2 + 10161^2 .

It is not an unprimeable number, because it can be changed into a prime (1022002649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255500659 + ... + 255500662.

Almost surely, 2^1022002642 is an apocalyptic number.

1022002642 is a deficient number, since it is larger than the sum of its proper divisors (511001324).

1022002642 is an equidigital number, since it uses as much as digits as its factorization.

1022002642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511001323.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 1022002642 is about 31968.7760478877. The cubic root of 1022002642 is about 1007.2810713340.

Adding to 1022002642 its reverse (2462002201), we get a palindrome (3484004843).

The spelling of 1022002642 in words is "one billion, twenty-two million, two thousand, six hundred forty-two".