55437709 has 2 divisors, whose sum is σ = 55437710. Its totient is φ = 55437708.

The previous prime is 55437667. The next prime is 55437721. The reversal of 55437709 is 90773455.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40921609 + 14516100 = 6397^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 55437709 - 2¹¹ = 55435661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55437779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27718854 + 27718855.

It is an arithmetic number, because the mean of its divisors is an integer number (27718855).

Almost surely, 2^55437709 is an apocalyptic number.

It is an amenable number.

55437709 is a deficient number, since it is larger than the sum of its proper divisors (1).

55437709 is an equidigital number, since it uses as much as digits as its factorization.

55437709 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 132300, while the sum is 40.

The square root of 55437709 is about 7445.6503409709. The cubic root of 55437709 is about 381.3014219273.

The spelling of 55437709 in words is "fifty-five million, four hundred thirty-seven thousand, seven hundred nine".