1020402001 has 8 divisors (see below), whose sum is σ = 1030251744. Its totient is φ = 1010599680.

The previous prime is 1020401929. The next prime is 1020402037. The reversal of 1020402001 is 1002040201.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020402001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020402601) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32166 + ... + 55456.

It is an arithmetic number, because the mean of its divisors is an integer number (128781468).

Almost surely, 2^1020402001 is an apocalyptic number.

It is an amenable number.

1020402001 is a deficient number, since it is larger than the sum of its proper divisors (9849743).

1020402001 is a wasteful number, since it uses less digits than its factorization.

1020402001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23711.

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

The square root of 1020402001 is about 31943.7317951425. The cubic root of 1020402001 is about 1006.7549351110.

Adding to 1020402001 its reverse (1002040201), we get a palindrome (2022442202).

It can be divided in two parts, 102040200 and 1, that added together give a palindrome (102040201).

The spelling of 1020402001 in words is "one billion, twenty million, four hundred two thousand, one".