6401851 has 4 divisors (see below), whose sum is σ = 6574912. Its totient is φ = 6228792.

The previous prime is 6401849. The next prime is 6401867. The reversal of 6401851 is 1581046.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1581046 = 2 ⋅790523.

It is a cyclic number.

It is not a de Polignac number, because 6401851 - 2¹ = 6401849 is a prime.

It is a Duffinian number.

6401851 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (6401831) 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, 86475 + ... + 86548.

It is an arithmetic number, because the mean of its divisors is an integer number (1643728).

Almost surely, 2^6401851 is an apocalyptic number.

6401851 is a deficient number, since it is larger than the sum of its proper divisors (173061).

6401851 is a wasteful number, since it uses less digits than its factorization.

6401851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173060.

The product of its (nonzero) digits is 960, while the sum is 25.

The square root of 6401851 is about 2530.1879376837. The cubic root of 6401851 is about 185.6814507461.

Adding to 6401851 its reverse (1581046), we get a palindrome (7982897).

The spelling of 6401851 in words is "six million, four hundred one thousand, eight hundred fifty-one".