6401022541 has 4 divisors (see below), whose sum is σ = 6557145084. Its totient is φ = 6244900000.

The previous prime is 6401022469. The next prime is 6401022547. The reversal of 6401022541 is 1452201046.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 3359941225 + 3041081316 = 57965^2 + 55146^2 .

It is a cyclic number.

It is not a de Polignac number, because 6401022541 - 2⁷ = 6401022413 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 (6401022547) 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, 78061210 + ... + 78061291.

It is an arithmetic number, because the mean of its divisors is an integer number (1639286271).

Almost surely, 2^6401022541 is an apocalyptic number.

It is an amenable number.

6401022541 is a deficient number, since it is larger than the sum of its proper divisors (156122543).

6401022541 is a wasteful number, since it uses less digits than its factorization.

6401022541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156122542.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 6401022541 is about 80006.3906259994. The cubic root of 6401022541 is about 1856.7344076563.

Adding to 6401022541 its reverse (1452201046), we get a palindrome (7853223587).

The spelling of 6401022541 in words is "six billion, four hundred one million, twenty-two thousand, five hundred forty-one".