55731409 has 2 divisors, whose sum is σ = 55731410. Its totient is φ = 55731408.

The previous prime is 55731371. The next prime is 55731413. The reversal of 55731409 is 90413755.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55726225 + 5184 = 7465^2 + 72^2 .

It is a cyclic number.

It is not a de Polignac number, because 55731409 - 2¹¹ = 55729361 is a prime.

It is not a weakly prime, because it can be changed into another prime (55731439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27865704 + 27865705.

It is an arithmetic number, because the mean of its divisors is an integer number (27865705).

Almost surely, 2^55731409 is an apocalyptic number.

It is an amenable number.

55731409 is a deficient number, since it is larger than the sum of its proper divisors (1).

55731409 is an equidigital number, since it uses as much as digits as its factorization.

55731409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18900, while the sum is 34.

The square root of 55731409 is about 7465.3472122869. The cubic root of 55731409 is about 381.9735940191.

The spelling of 55731409 in words is "fifty-five million, seven hundred thirty-one thousand, four hundred nine".