6155551 has 2 divisors, whose sum is σ = 6155552. Its totient is φ = 6155550.

The previous prime is 6155549. The next prime is 6155561. The reversal of 6155551 is 1555516.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 6155551 - 2¹ = 6155549 is a prime.

It is a super-2 number, since 2×6155551² = 75781616227202, which contains 22 as substring.

Together with 6155549, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6155531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3077775 + 3077776.

It is an arithmetic number, because the mean of its divisors is an integer number (3077776).

Almost surely, 2^6155551 is an apocalyptic number.

6155551 is a deficient number, since it is larger than the sum of its proper divisors (1).

6155551 is an equidigital number, since it uses as much as digits as its factorization.

6155551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3750, while the sum is 28.

The square root of 6155551 is about 2481.0382907162. The cubic root of 6155551 is about 183.2689864170.

The spelling of 6155551 in words is "six million, one hundred fifty-five thousand, five hundred fifty-one".