55881607 has 2 divisors, whose sum is σ = 55881608. Its totient is φ = 55881606.

The previous prime is 55881589. The next prime is 55881619. The reversal of 55881607 is 70618855.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55881607 - 2⁷ = 55881479 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55881607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55881107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27940803 + 27940804.

It is an arithmetic number, because the mean of its divisors is an integer number (27940804).

Almost surely, 2^55881607 is an apocalyptic number.

55881607 is a deficient number, since it is larger than the sum of its proper divisors (1).

55881607 is an equidigital number, since it uses as much as digits as its factorization.

55881607 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 67200, while the sum is 40.

The square root of 55881607 is about 7475.4001230703. The cubic root of 55881607 is about 382.3164300632.

The spelling of 55881607 in words is "fifty-five million, eight hundred eighty-one thousand, six hundred seven".