6151164221 has 4 divisors (see below), whose sum is σ = 6152054844. Its totient is φ = 6150273600.

The previous prime is 6151164211. The next prime is 6151164263. The reversal of 6151164221 is 1224611516.

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 5301441721 + 849722500 = 72811^2 + 29150^2 .

It is a cyclic number.

It is not a de Polignac number, because 6151164221 - 2⁶ = 6151164157 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 (6151164211) 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, 434870 + ... + 448791.

It is an arithmetic number, because the mean of its divisors is an integer number (1538013711).

Almost surely, 2^6151164221 is an apocalyptic number.

It is an amenable number.

6151164221 is a deficient number, since it is larger than the sum of its proper divisors (890623).

6151164221 is an equidigital number, since it uses as much as digits as its factorization.

6151164221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890622.

The product of its digits is 2880, while the sum is 29.

The square root of 6151164221 is about 78429.3581575165. The cubic root of 6151164221 is about 1832.2544026937.

Adding to 6151164221 its reverse (1224611516), we get a palindrome (7375775737).

The spelling of 6151164221 in words is "six billion, one hundred fifty-one million, one hundred sixty-four thousand, two hundred twenty-one".