55215649 has 2 divisors, whose sum is σ = 55215650. Its totient is φ = 55215648.

The previous prime is 55215637. The next prime is 55215659. The reversal of 55215649 is 94651255.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46335249 + 8880400 = 6807^2 + 2980^2 .

It is a cyclic number.

It is not a de Polignac number, because 55215649 - 2¹⁷ = 55084577 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55215659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27607824 + 27607825.

It is an arithmetic number, because the mean of its divisors is an integer number (27607825).

Almost surely, 2^55215649 is an apocalyptic number.

It is an amenable number.

55215649 is a deficient number, since it is larger than the sum of its proper divisors (1).

55215649 is an equidigital number, since it uses as much as digits as its factorization.

55215649 is an evil number, because the sum of its binary digits is even.

The product of its digits is 54000, while the sum is 37.

The square root of 55215649 is about 7430.7233160709. The cubic root of 55215649 is about 380.7916299423.

The spelling of 55215649 in words is "fifty-five million, two hundred fifteen thousand, six hundred forty-nine".