4001651 has 4 divisors (see below), whose sum is σ = 4028304. Its totient is φ = 3975000.

The previous prime is 4001639. The next prime is 4001689. The reversal of 4001651 is 1561004.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-4001651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4001611) 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, 13100 + ... + 13401.

It is an arithmetic number, because the mean of its divisors is an integer number (1007076).

Almost surely, 2^4001651 is an apocalyptic number.

4001651 is a deficient number, since it is larger than the sum of its proper divisors (26653).

4001651 is a wasteful number, since it uses less digits than its factorization.

4001651 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26652.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 4001651 is about 2000.4127074181. The cubic root of 4001651 is about 158.7619421855.

Adding to 4001651 its reverse (1561004), we get a palindrome (5562655).

The spelling of 4001651 in words is "four million, one thousand, six hundred fifty-one".