55821769 has 2 divisors, whose sum is σ = 55821770. Its totient is φ = 55821768.

The previous prime is 55821767. The next prime is 55821803. The reversal of 55821769 is 96712855.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 30691600 + 25130169 = 5540^2 + 5013^2 .

It is a cyclic number.

It is not a de Polignac number, because 55821769 - 2¹ = 55821767 is a prime.

It is a super-2 number, since 2×55821769² = 6232139788578722, which contains 22 as substring.

Together with 55821767, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55821767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27910884 + 27910885.

It is an arithmetic number, because the mean of its divisors is an integer number (27910885).

Almost surely, 2^55821769 is an apocalyptic number.

It is an amenable number.

55821769 is a deficient number, since it is larger than the sum of its proper divisors (1).

55821769 is an equidigital number, since it uses as much as digits as its factorization.

55821769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 151200, while the sum is 43.

The square root of 55821769 is about 7471.3967235049. The cubic root of 55821769 is about 382.1799199054.

The spelling of 55821769 in words is "fifty-five million, eight hundred twenty-one thousand, seven hundred sixty-nine".