6401022501 has 4 divisors (see below), whose sum is σ = 8534696672. Its totient is φ = 4267348332.

The previous prime is 6401022469. The next prime is 6401022547. The reversal of 6401022501 is 1052201046.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6401022501 - 2⁵ = 6401022469 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6401022601) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1066837081 + ... + 1066837086.

It is an arithmetic number, because the mean of its divisors is an integer number (2133674168).

Almost surely, 2^6401022501 is an apocalyptic number.

It is an amenable number.

6401022501 is a deficient number, since it is larger than the sum of its proper divisors (2133674171).

6401022501 is a wasteful number, since it uses less digits than its factorization.

6401022501 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2133674170.

The product of its (nonzero) digits is 480, while the sum is 21.

The square root of 6401022501 is about 80006.3903760193. The cubic root of 6401022501 is about 1856.7344037888.

Adding to 6401022501 its reverse (1052201046), we get a palindrome (7453223547).

The spelling of 6401022501 in words is "six billion, four hundred one million, twenty-two thousand, five hundred one".