1002021641 has 2 divisors, whose sum is σ = 1002021642. Its totient is φ = 1002021640.

The previous prime is 1002021613. The next prime is 1002021689. The reversal of 1002021641 is 1461202001.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 866066041 + 135955600 = 29429^2 + 11660^2 .

It is a cyclic number.

It is not a de Polignac number, because 1002021641 - 2⁶ = 1002021577 is a prime.

It is a super-4 number, since 4×1002021641⁴ (a number of 37 digits) contains 4444 as substring.

It is not a weakly prime, because it can be changed into another prime (1002021941) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 501010820 + 501010821.

It is an arithmetic number, because the mean of its divisors is an integer number (501010821).

Almost surely, 2^1002021641 is an apocalyptic number.

It is an amenable number.

1002021641 is a deficient number, since it is larger than the sum of its proper divisors (1).

1002021641 is an equidigital number, since it uses as much as digits as its factorization.

1002021641 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1002021641 is about 31654.7254134355. The cubic root of 1002021641 is about 1000.6734267280.

Adding to 1002021641 its reverse (1461202001), we get a palindrome (2463223642).

The spelling of 1002021641 in words is "one billion, two million, twenty-one thousand, six hundred forty-one".