55571407 has 2 divisors, whose sum is σ = 55571408. Its totient is φ = 55571406.

The previous prime is 55571389. The next prime is 55571443. The reversal of 55571407 is 70417555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55571407 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55571497) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27785703 + 27785704.

It is an arithmetic number, because the mean of its divisors is an integer number (27785704).

Almost surely, 2^55571407 is an apocalyptic number.

55571407 is a deficient number, since it is larger than the sum of its proper divisors (1).

55571407 is an equidigital number, since it uses as much as digits as its factorization.

55571407 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24500, while the sum is 34.

The square root of 55571407 is about 7454.6231963795. The cubic root of 55571407 is about 381.6077014819.

The spelling of 55571407 in words is "fifty-five million, five hundred seventy-one thousand, four hundred seven".