55620181 has 2 divisors, whose sum is σ = 55620182. Its totient is φ = 55620180.

The previous prime is 55620137. The next prime is 55620203. The reversal of 55620181 is 18102655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46799281 + 8820900 = 6841^2 + 2970^2 .

It is a cyclic number.

It is not a de Polignac number, because 55620181 - 2⁷ = 55620053 is a prime.

It is a super-2 number, since 2×55620181² = 6187209068945522, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55620101) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27810090 + 27810091.

It is an arithmetic number, because the mean of its divisors is an integer number (27810091).

Almost surely, 2^55620181 is an apocalyptic number.

It is an amenable number.

55620181 is a deficient number, since it is larger than the sum of its proper divisors (1).

55620181 is an equidigital number, since it uses as much as digits as its factorization.

55620181 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 55620181 is about 7457.8938715967. The cubic root of 55620181 is about 381.7193121848.

The spelling of 55620181 in words is "fifty-five million, six hundred twenty thousand, one hundred eighty-one".