55393969 has 2 divisors, whose sum is σ = 55393970. Its totient is φ = 55393968.

The previous prime is 55393963. The next prime is 55393991. The reversal of 55393969 is 96939355.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 34963569 + 20430400 = 5913^2 + 4520^2 .

It is a cyclic number.

It is not a de Polignac number, because 55393969 - 2⁵ = 55393937 is a prime.

It is a super-2 number, since 2×55393969² = 6136983603145922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (55393963) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27696984 + 27696985.

It is an arithmetic number, because the mean of its divisors is an integer number (27696985).

Almost surely, 2^55393969 is an apocalyptic number.

It is an amenable number.

55393969 is a deficient number, since it is larger than the sum of its proper divisors (1).

55393969 is an equidigital number, since it uses as much as digits as its factorization.

55393969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 984150, while the sum is 49.

The square root of 55393969 is about 7442.7124759727. The cubic root of 55393969 is about 381.2011140758.

The spelling of 55393969 in words is "fifty-five million, three hundred ninety-three thousand, nine hundred sixty-nine".