6151721 has 2 divisors, whose sum is σ = 6151722. Its totient is φ = 6151720.

The previous prime is 6151699. The next prime is 6151727. The reversal of 6151721 is 1271516.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3705625 + 2446096 = 1925^2 + 1564^2 .

It is a cyclic number.

It is not a de Polignac number, because 6151721 - 2¹⁸ = 5889577 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6151727) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3075860 + 3075861.

It is an arithmetic number, because the mean of its divisors is an integer number (3075861).

Almost surely, 2^6151721 is an apocalyptic number.

It is an amenable number.

6151721 is a deficient number, since it is larger than the sum of its proper divisors (1).

6151721 is an equidigital number, since it uses as much as digits as its factorization.

6151721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 420, while the sum is 23.

The square root of 6151721 is about 2480.2663163459. The cubic root of 6151721 is about 183.2309683827.

The spelling of 6151721 in words is "six million, one hundred fifty-one thousand, seven hundred twenty-one".