55142189 has 2 divisors, whose sum is σ = 55142190. Its totient is φ = 55142188.

The previous prime is 55142179. The next prime is 55142239. The reversal of 55142189 is 98124155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 46922500 + 8219689 = 6850^2 + 2867^2 .

It is a cyclic number.

It is not a de Polignac number, because 55142189 - 2¹² = 55138093 is a prime.

It is a super-2 number, since 2×55142189² = 6081322015423442, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55142179) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27571094 + 27571095.

It is an arithmetic number, because the mean of its divisors is an integer number (27571095).

Almost surely, 2^55142189 is an apocalyptic number.

It is an amenable number.

55142189 is a deficient number, since it is larger than the sum of its proper divisors (1).

55142189 is an equidigital number, since it uses as much as digits as its factorization.

55142189 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14400, while the sum is 35.

The square root of 55142189 is about 7425.7786797076. The cubic root of 55142189 is about 380.6226840724.

The spelling of 55142189 in words is "fifty-five million, one hundred forty-two thousand, one hundred eighty-nine".