1020401002 has 4 divisors (see below), whose sum is σ = 1530601506. Its totient is φ = 510200500.

The previous prime is 1020400987. The next prime is 1020401017. The reversal of 1020401002 is 2001040201.

1020401002 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is an interprime number because it is at equal distance from previous prime (1020400987) and next prime (1020401017).

It can be written as a sum of positive squares in only one way, i.e., 763472161 + 256928841 = 27631^2 + 16029^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1020401002.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 255100249 + ... + 255100252.

Almost surely, 2^1020401002 is an apocalyptic number.

1020401002 is a deficient number, since it is larger than the sum of its proper divisors (510200504).

1020401002 is an equidigital number, since it uses as much as digits as its factorization.

1020401002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 510200503.

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 1020401002 is about 31943.7161582681. The cubic root of 1020401002 is about 1006.7546065645.

Adding to 1020401002 its reverse (2001040201), we get a palindrome (3021441203).

The spelling of 1020401002 in words is "one billion, twenty million, four hundred one thousand, two".