55778539 has 2 divisors, whose sum is σ = 55778540. Its totient is φ = 55778538.

The previous prime is 55778531. The next prime is 55778543. The reversal of 55778539 is 93587755.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55778539 - 2³ = 55778531 is a prime.

It is a super-2 number, since 2×55778539² = 6222490825949042, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55778492 and 55778501.

It is not a weakly prime, because it can be changed into another prime (55778531) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27889269 + 27889270.

It is an arithmetic number, because the mean of its divisors is an integer number (27889270).

Almost surely, 2^55778539 is an apocalyptic number.

55778539 is a deficient number, since it is larger than the sum of its proper divisors (1).

55778539 is an equidigital number, since it uses as much as digits as its factorization.

55778539 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1323000, while the sum is 49.

The square root of 55778539 is about 7468.5031298112. The cubic root of 55778539 is about 382.0812373483.

The spelling of 55778539 in words is "fifty-five million, seven hundred seventy-eight thousand, five hundred thirty-nine".