4215551 has 2 divisors, whose sum is σ = 4215552. Its totient is φ = 4215550.

The previous prime is 4215539. The next prime is 4215553. The reversal of 4215551 is 1555124.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 4215551 - 2²² = 21247 is a prime.

It is a Sophie Germain prime.

Together with 4215553, 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 (4215553) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2107775 + 2107776.

It is an arithmetic number, because the mean of its divisors is an integer number (2107776).

Almost surely, 2^4215551 is an apocalyptic number.

4215551 is a deficient number, since it is larger than the sum of its proper divisors (1).

4215551 is an equidigital number, since it uses as much as digits as its factorization.

4215551 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1000, while the sum is 23.

The square root of 4215551 is about 2053.1807032017. The cubic root of 4215551 is about 161.5417497267.

The spelling of 4215551 in words is "four million, two hundred fifteen thousand, five hundred fifty-one".