55061969 has 2 divisors, whose sum is σ = 55061970. Its totient is φ = 55061968.

The previous prime is 55061939. The next prime is 55061971. The reversal of 55061969 is 96916055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30658369 + 24403600 = 5537^2 + 4940^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55061969 is a prime.

It is a super-2 number, since 2×55061969² = 6063640860313922, which contains 22 as substring.

It is a Sophie Germain prime.

Together with 55061971, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (55061939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27530984 + 27530985.

It is an arithmetic number, because the mean of its divisors is an integer number (27530985).

Almost surely, 2^55061969 is an apocalyptic number.

It is an amenable number.

55061969 is a deficient number, since it is larger than the sum of its proper divisors (1).

55061969 is an equidigital number, since it uses as much as digits as its factorization.

55061969 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72900, while the sum is 41.

The square root of 55061969 is about 7420.3752600526. The cubic root of 55061969 is about 380.4380198384.

The spelling of 55061969 in words is "fifty-five million, sixty-one thousand, nine hundred sixty-nine".