55689497 has 2 divisors, whose sum is σ = 55689498. Its totient is φ = 55689496.

The previous prime is 55689479. The next prime is 55689503. The reversal of 55689497 is 79498655.

Together with previous prime (55689479) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 38887696 + 16801801 = 6236^2 + 4099^2 .

It is a cyclic number.

It is not a de Polignac number, because 55689497 - 2⁸ = 55689241 is a prime.

It is a super-2 number, since 2×55689497² = 6202640152226018, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55689427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27844748 + 27844749.

It is an arithmetic number, because the mean of its divisors is an integer number (27844749).

Almost surely, 2^55689497 is an apocalyptic number.

It is an amenable number.

55689497 is a deficient number, since it is larger than the sum of its proper divisors (1).

55689497 is an equidigital number, since it uses as much as digits as its factorization.

55689497 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2721600, while the sum is 53.

The square root of 55689497 is about 7462.5395811346. The cubic root of 55689497 is about 381.8778174339.

The spelling of 55689497 in words is "fifty-five million, six hundred eighty-nine thousand, four hundred ninety-seven".