55891669 has 2 divisors, whose sum is σ = 55891670. Its totient is φ = 55891668.

The previous prime is 55891643. The next prime is 55891741. The reversal of 55891669 is 96619855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 44756100 + 11135569 = 6690^2 + 3337^2 .

It is a cyclic number.

It is not a de Polignac number, because 55891669 - 2¹⁹ = 55367381 is a prime.

It is a super-2 number, since 2×55891669² = 6247757327211122, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55891639) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27945834 + 27945835.

It is an arithmetic number, because the mean of its divisors is an integer number (27945835).

Almost surely, 2^55891669 is an apocalyptic number.

It is an amenable number.

55891669 is a deficient number, since it is larger than the sum of its proper divisors (1).

55891669 is an equidigital number, since it uses as much as digits as its factorization.

55891669 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 583200, while the sum is 49.

The square root of 55891669 is about 7476.0731002312. The cubic root of 55891669 is about 382.3393752221.

The spelling of 55891669 in words is "fifty-five million, eight hundred ninety-one thousand, six hundred sixty-nine".