55012861 has 2 divisors, whose sum is σ = 55012862. Its totient is φ = 55012860.

The previous prime is 55012843. The next prime is 55012883. The reversal of 55012861 is 16821055.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 54848836 + 164025 = 7406^2 + 405^2 .

It is a cyclic number.

It is not a de Polignac number, because 55012861 - 2¹³ = 55004669 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55012831) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27506430 + 27506431.

It is an arithmetic number, because the mean of its divisors is an integer number (27506431).

Almost surely, 2^55012861 is an apocalyptic number.

It is an amenable number.

55012861 is a deficient number, since it is larger than the sum of its proper divisors (1).

55012861 is an equidigital number, since it uses as much as digits as its factorization.

55012861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2400, while the sum is 28.

The square root of 55012861 is about 7417.0655248555. The cubic root of 55012861 is about 380.3248860518.

The spelling of 55012861 in words is "fifty-five million, twelve thousand, eight hundred sixty-one".