1020001651 has 4 divisors (see below), whose sum is σ = 1020369904. Its totient is φ = 1019633400.

The previous prime is 1020001639. The next prime is 1020001663. The reversal of 1020001651 is 1561000201.

It is a happy number.

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 (1020001639) and next prime (1020001663).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1020001651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1020001621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 179940 + ... + 185521.

It is an arithmetic number, because the mean of its divisors is an integer number (255092476).

Almost surely, 2^1020001651 is an apocalyptic number.

1020001651 is a deficient number, since it is larger than the sum of its proper divisors (368253).

1020001651 is an equidigital number, since it uses as much as digits as its factorization.

1020001651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 368252.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 1020001651 is about 31937.4646927398. The cubic root of 1020001651 is about 1006.6232526755.

Adding to 1020001651 its reverse (1561000201), we get a palindrome (2581001852).

The spelling of 1020001651 in words is "one billion, twenty million, one thousand, six hundred fifty-one".