6401951 has 4 divisors (see below), whose sum is σ = 6432504. Its totient is φ = 6371400.

The previous prime is 6401939. The next prime is 6401959. The reversal of 6401951 is 1591046.

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 6401951 - 2⁶ = 6401887 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6401951.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401959) 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, 14960 + ... + 15381.

It is an arithmetic number, because the mean of its divisors is an integer number (1608126).

Almost surely, 2^6401951 is an apocalyptic number.

6401951 is a deficient number, since it is larger than the sum of its proper divisors (30553).

6401951 is a wasteful number, since it uses less digits than its factorization.

6401951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30552.

The product of its (nonzero) digits is 1080, while the sum is 26.

The square root of 6401951 is about 2530.2076989844. The cubic root of 6401951 is about 185.6824175524.

Adding to 6401951 its reverse (1591046), we get a palindrome (7992997).

The spelling of 6401951 in words is "six million, four hundred one thousand, nine hundred fifty-one".