4020251 has 4 divisors (see below), whose sum is σ = 4036152. Its totient is φ = 4004352.

The previous prime is 4020227. The next prime is 4020257. The reversal of 4020251 is 1520204.

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

It is a cyclic number.

It is not a de Polignac number, because 4020251 - 2¹⁸ = 3758107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (4020257) 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, 7565 + ... + 8078.

It is an arithmetic number, because the mean of its divisors is an integer number (1009038).

Almost surely, 2^4020251 is an apocalyptic number.

4020251 is a deficient number, since it is larger than the sum of its proper divisors (15901).

4020251 is a wasteful number, since it uses less digits than its factorization.

4020251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15900.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 4020251 is about 2005.0563583102. The cubic root of 4020251 is about 159.0075415380.

Adding to 4020251 its reverse (1520204), we get a palindrome (5540455).

The spelling of 4020251 in words is "four million, twenty thousand, two hundred fifty-one".